Quiz OS&CN

OS & CN Quiz

Contents Quiz 01 OS .................................. .................................................. ................................. .................................. ................................. ................................. ....................... ...... 2 Quiz 02 OS .................................. .................................................. ................................. .................................. ................................. ................................. ....................... ...... 5 Quiz 03 OS .................................. .................................................. ................................. .................................. ................................. ................................. ....................... ...... 8 Quiz 04 OS .................................. .................................................. ................................. .................................. ................................. ................................. ..................... .... 10 Quiz 05 OS .................................. .................................................. ................................. .................................. ................................. ................................. ..................... .... 15 Quiz 01 CN .................................. .................................................. ................................. .................................. ................................. ................................. ..................... .... 18 Quiz 02 CN .................................. .................................................. ................................. .................................. ................................. ................................. ..................... .... 20 Quiz 03 CN .................................. .................................................. ................................. .................................. ................................. ................................. ..................... .... 23 Quiz 04 CN .................................. .................................................. ................................. .................................. ................................. ................................. ..................... .... 27

Quiz 01 OS Which of these statements about address space are not true? Select one: a. Address space space is the abstraction abstraction that that is referenced referenced to the set of addresses addresses a process b. None of others c. Address space is decoupled from the physical memory  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of these statements about files are true? Select one or more: a. b. c. d.

File is a collection of related related information information File is an abstraction of of data stored on HDD File provides provides a place to keep files or a way way of grouping grouping file together together File includes includes block block special tiles and character special files

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of these statements about address space are true? Select one or more: a. Address space space is the abstraction abstraction that that is referenced referenced to the set of addresses addresses a process process b. Address space space is a space contain contain the address of of variables variables c. Address space is decoupled from the physical memory  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Server OS serves multiple users at once over a network and allow the users to share --------and ------------ resources Select one: a. b. c. d.

Hardware, firmware Hardware, software Software, firmware Firmware, hardware

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Symbian, Palm, Windows Mobile, Windows CE are --------Select one: a. b. c. d.

Handheld OS Multiprocessor Multiprocessor OS PC OS Mainframe OS

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of these statements about files are not true? Select one:

a. File is an abstraction of of data stored on HDD b. File provides provides a place to keep files files or a way way of grouping grouping files together together c. File contains contains correlated correlated information: information: path name, root root directory, file descriptor, descriptor, Mourited file system, special file, a pipe d. File includes includes block block special files and character special files  ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  Embedded OS is located in ----------Select one: a. b. c. d.

DISK RAM BIOS ROM

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------systems are used in time-critical environments where reliability reliability is key k ey and data must be processed within a strict time limit Select one: a. b. c. d.

Embedded Real-time Hybrid Interactive

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  MainframeOS offers 3 kinds of services ----------Select one: a. b. c. d.

Batch, time-sharing, time-sharing, scheduler scheduler Real-time, batch, time-sharing Real-time, time sharing, protection Transaction processing, batch, time-sharing

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------------ process routine job without interactive user present Select one: a. b. c. d.

Transaction processing systems Time sharing systems Batch systems Real-time systems

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ---------------- runs on systems that have many CPUs (multi-processors, multi-cores, multi-cores, multichips) Select one: a. Multiprocessor Multiprocessor OS

b. Embedded OS c. PC OS d. Server OS  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of these statements about processes are not true? Select one or more: a. b. c. d. e.

In modern OS, only single process exists at at time Process table stores stores all the information information of processes processes Process is a program on disk Associated with with each process is its file and directory Associated with with each process process is set set of resources such as executable executable code, code, data, stack, CPU registers value, and other information needing to run a program

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of these statements about processes are true? Select one or more: a. A program in execution b. Process table stores stores all the information information of processes processes c. Associated with with each process process is set set of resources such as executable executable code, code, data, stack, CPU registers value, and other information needing to run a program d. A program on disk e. Associated with with each process is its file file and directory  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------- serves multiple users at once over a network and allow the users to share hardware and software resources Select one: a. b. c. d.

Mainframe OS PC OS Server OS Multiprocessor Multiprocessor OS

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Real-time system has ----------- and -------------- real-time system types Select one or more: a. b. c. d.

Paper Soft Firm Hard

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------ offers 3 kinds of services: batch, transaction processing, processing, timesharing Select one:

a. b. c. d.

PC OS Mainframe OS Server OS Multiprocessor Multiprocessor OS

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   Allow multiple multiple remote users to run jobs on the computer computer at once Select one: a. b. c. d.

Real-time systems Batch systems Time sharing systems Transaction processing systems

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Handling large numbers of small requests Select one: a. b. c. d.

Real-time systems Time sharing systems Batch systems Transaction processing systems

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ---------- supports with dozens of programs started up at the boot time Select one: a. b. c. d.

Multi-scheduling Multi-processor Multi-core Multi-programming

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______ 

Quiz 02 OS How much time is reasonable for the quantum in Round-Robin algorithm ? Select one: a. b. c. d.

46 msec 16 msec 64 msec 128 msec

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which statement is correct? Select one: a. Process and thread are similar b. A thread can create many processes

c.  A process can create create many threads d. A process can only own a thread  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In which situation does race condition occur? Select one: a. b. c. d.

Two threads threads in a process process update update their stacks Two threads in a process modify a global variable Two processes communicate using socket A parent parent process process creates a child child process process

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In a batch system, scheduling by SJF is provably better than FCFS if ------------Select one: a. b. c. d.

Process requests requests come simultaneously simultaneously and Turnaround Turnaround time is longer Process requests requests come simultaneously simultaneously and Turnaround Turnaround time is shorter Process requests requests come consequently and Turnaround Turnaround time is shorter Process requests requests come consequently and Turnaround Turnaround time is is longer

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  If a process finishes a time interval with CPU, its state switches -----------Select one: a. b. c. d.

From blocked to ready From running to blocked From running to ready From ready to running

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Two or more processes accessing accessing to a shared memory is an example of ----------Select one: a. b. c. d.

Mutual exclusion Interprocess communication communication Race condition Critical region

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which system requires pre-emptive scheduling algorithm? Select one: a. b. c. d.

Interactive systems Quantum systems All of the others Batch systems

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______ 

What happen if 2 processes have same priority in the Priority scheduling scheduling algorithm? Select one: a. Serve the process process that has has shorter burst burst time first, let let the process that has longer longer burst time wait b. None of the others c. Use Priority-inheritance Priority-inheritance solution. d. Serve the process process that comes comes first, let the process that that comes later later wait  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which event cannot cause process creation? Select one: a. b. c. d.

A running running process process creates creates a set of threads A running running process performs a process creation creation system system call An operating system initializes a service service A user executes a program

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which event causes process involuntary termination? termination? Select one: a. b. c. d.

Error exit Fatal error Fatal exit Kill exit

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which statement is correct? Select one: a. b. c. d.

Shortest process process next next is advantageous for long jobs Round-robin with high quantum is advantageous for long jobs Shortest job first is advantageous advantageous for long long jobs First come first serve is advantageous advantageous for short jobs

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of the following is the benefit of thread? Select one: a. b. c. d.

Synchronization All of the others Dependence Resource sharing

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   All threads in a process process share Select one:

a. b. c. d.

Address space Register Program counter Stack

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Choose the correct solution(s) for the process synchronization synchronization problems Select one: a. b. c. d.

Busy waiting Semaphore Sleep and Wakeup All of the others

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______ 

Quiz 03 OS Memory compaction is a mechanism to ---------Select one: a. b. c. d.

Increase virtual memory size Reduce memory fragmentation fragmenta tion Load a page into memory due to page fault Replace a page by another page for a process

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   A page table entry entry does not provide provide information about -----------Select one: a. b. c. d.

What page frame number is What page size is Whether a page is modified or not Whether a page is present in memory or not

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  How many linear address spaces does paging provide? Select one: a. b. c. d.

Maximum RAM space Unlimited 1024 1

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What happen if there is no memory abstraction? Select one: a. Only one one program program can write to the memory memory b. A program program can prevent others to access memory

c. Program‟s physical memory could be accessed by others d. Only one program can read the memory while others can write write  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is the problem of swapping memory? Select one: a. b. c. d.

All of the others Difficult to know where to allocate allocate a program Difficult to know how to monitor a memory hole Difficult to know know how much memory should be be allocated for a program program

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In a swapping system, memory consists of the following block sizes in memory order: 12KB, 20 KB, 7KB, 9KB, 5KB, and 11KB. W hich block is taken for a request of 10KB using the best fit algorithm? Select one: a. b. c. d.

20KB 12KB 9KB 11KB

 ___________________  _________ ___________________ ___________________ ____________________ ___________________ __________________ ________________  _______  Global page replacement policy -------------Select one: a. b. c. d.

Uses the first-in-first-out first-in-first-out page for replacement replacement Uses a page belonging to the same process for replacement Uses the least recently recently used used page page for replacement replacement Uses a page belonging to another process for replacement

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which statement is incorrect for a page? Select one: a. b. c. d.

A page can be relocated to a different chunk of physical physical address during operation A page is mapped to a contiguous chunk of physical address A page is a contiguous chunk of virtual address A page can get various sizes in an operating system

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The replacement policy replaces the page that has not been referenced for the longest time Select one: a. b. c. d.

Least recently used (LRU) policy Clock policy Optimal policy First in first out out (FIFO) policy

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which technique requires the programmer to be aware that it is being used? Select one: a. b. c. d.

Not Recently Used Least Recently Used Pure Segmentation Segmentation Paging

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is the best fit to allocate free memory to programs? Select one: a. b. c. d.

Search entire entire list, find the hole close close to the actual size Search entire entire list, finds the hole has the largest largest size None of the others Search entire entire list, finds the hole match match with the actual size

 ___________________  _________ ____________________ ___________________ __________________ ___________________ ___________________ ________________  _______  Using virtual memory allows ------------Select one: a. b. c. d.

Fewer programs to be executed at the same time time More programs to be executed at the same time time More complex complex programs programs to be be executed executed at the same time Smaller programs programs to be executed executed at the same time

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The worst fit algorithm allocates memory to a request by ------------------------------------Select one: a. Choosing the first available available memory block block that is large enough from the location of the last placement b. Choosing the largest available memory block c. Choosing the memory block that that is closest closest in size size to the request request d. Choosing the first available available memory block block that is large enough enough from the beginning beginning of the memory  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______ 

Quiz 04 OS The 775 mode of a file in UNIX indicates ------------------------------Select one: a. This file has read and execute execute permissions permissions for all users users b. This file has has read permissions permissions for all all users, execute execute permissions permissions for group group owner, owner, and write permission for file owner c. This file has has read, write write and execute execute permissions permissions for file owner only only

d. This file has read and execute permissions permissions for all all users and write write permission permission for file owner  ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  Calls to modify file content based on file descriptor such as read() or write() on Unix are referred to as --------------------Select one: a. b. c. d.

Function calls Procedure calls System calls User calls

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   A --------------- is created created when a user user opens an account account to access the computer computer system. Select one: a. b. c. d.

Directory Volume MFD Subdirectory

 ___________________  _________ ___________________ ___________________ ____________________ ___________________ __________________ ________________  _______   Allocating a single single set of blocks blocks with the first block block and length to a file at the time of creating creating is referred to as -------------Select one: a. b. c. d.

i-node allocation contiguous allocation link list allocation chained allocation

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Step 01. MBR locates the active partition, reads in its boot block and executes it Step 02. The computer is booted, the BIOS reads in and executes the MBR Step 03. The program in boot block loads the OS contained in that partition Mechanism of booted computer is Select one: a. b. c. d.

2, 3, 1 None of others 1, 2, 3 3, 2, 1

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   A symbolic link link in a file system on Unix is --------------------------------Select one:

a. b. c. d.

A A A A

file copied copied to appear in in more than one directory directory directory to store store special special files name created to point to a file naming another file file file created created to provide a backup of another file

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The purpose of an extension is to -----------Select one: a. b. c. d.

Identify the type of file Identify the file size Identify the file owner Identify the directory in which which the file is stored

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------- allocation allows allows files to t o use any storage st orage space available available on the t he disk. Select one: a. b. c. d.

Add-on storage Noncontiguous storage Contiguous storage Fragmented storage

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The File Manager is in charge of the system‟s ------------- components. components. Select one: a. b. c. d.

Electronic Physical Data Software

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  File descriptor of the standard error by default is an integer value --------------Select one: a. b. c. d.

2 3 1 0

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which one is not file structure? Select one: a. b. c. d.

Sequence of bytes Sequence of records Tree structure Star structure

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  When using random access files, the program used to store the data follows a set of instructions, called a ------------- algorithm, that transforms each key into a number, the record‟s logical address. Select one: a. b. c. d.

Lookup Grouping Translation Hashing

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The file‟s type includes ------------Select one: a. b. c. d.

Regular, Directories, Character Special Regular, Binary, Character Special, CD-ROM Regular, Directories, Character Special, Block Special Regular, Directories, Directories , Character Special, Device Driver

 ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  Which of these statements about the Linked List Allocation are true? Select one or more: a. First word of each block is used as pointer to the next one and the rest of of the block is for data b. The amount of data storage in a block is not a power of two because the pointer takes up a few bytes c. Random access is extremely slow d. Internal and External External fragmentation are generated  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The „1^(st)‟ block in each partition is called ---------Select one: a. b. c. d.

Super block MBR Boot block Free block

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The requirements for long-term information storage are -------------Select one or more: a. b. c. d.

Multiple processes must must be able to access the information information concurrently concurrently The information information must be survived the termination of of process using using it All of others It must be possible to store a very large amount amount of address address

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ----------- are special files with listings of filenames and their attributes. Select one: a. b. c. d.

Programs Databases Directories Data files

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The file system‟s function are ------------Select one or more: a. b. c. d.

Mapping files onto address space Hiding the complexity of storage hardware devices None of others Providing the users users a uniform logical logical view of the information stored on these devices devices

 ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  System calls for managing directories directories exclude ---------Select one: a. b. c. d.

Opendir Link Seed Unlink

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   A UNIX or Linux system system might identify a file as: /usr/imfst/flynn/inventory.doc. /usr/imfst/flynn/inventory.doc. What represents the root directory is ------------. - -----------. Select one: a. b. c. d.

usr / flynn imfst

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The file‟s structure includes ------------Select one: a. b. c. d.

unstructured sequence of unstructured sequence of unstructured sequence of unstructured sequence of

bytes, binary sequence, tree bytes, bytes, text, tree bytes, bytes, random, tree bytes, record sequence, tree

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________ _______

 As long as users refer refer to files in the ------------------------- directory, they can access their their files without entering the complete name from the highest level to the lowest. Select one: a. b. c. d.

home working default root

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  On magnetic disks, files can be organized in one of three ways; ------------Select one a. b. c. d.

sequential, direct, or indexed sequential indexed direct, indexed indexed indirect, or random random sequential, random, or indirect sequential, indirect, or direct

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ---------- are having one directory containing all files Select one: a. b. c. d.

Mono-Level Mono-Level Directory Systems Multi-Level Directory Systems Single-Level Directory Systems Hierarchical Directory Systems

Quiz 05 OS The controller‟s job to convert the t he --------- into a block of bytes and perform any ---------necessary Select one: a. b. c. d.

Error correction / serial serial bit stream stream Serial byte stream / interrupt Interrupt / serial byte stream Serial bit stream / error correction

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Without DMA, the ----------- is responsible for the physical movement of data between main memory and the device. Select one: a. b. c. d.

CPU Memory controller Bus Disk

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  I / O devices are ------------

Select one: a. b. c. d.

Video card, card, compact flash card, Ethernet card, card, wireless wireless card SATA disk disk drive, drive, mainboard, mainboard, SCSI disk, disk, modem CD-ROM, USB, monitor, scanner  Keyboard, mouse, printer, RAM memory

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which statement is incorrect for device driver? Select one: a. Device driver driver normally normally operates as as a part of of the operating operating system kernel b. Device driver is device control control register register and device data data buffer c. Device driver is generally written by the device‟s manufacturer and delivered along with the device d. Device driver driver is some device-specific device-specific code for controlling a device  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   A disk queue with with requests for I/O blocks blocks on cylinders cylinders in orders: 10, 22, 22, 20, 2, 40, 6, 38.  Assume that the disk disk head is initially initially at cylinder cylinder 18 and the head move move downward. downward. How many cylinders does Total head movement move when the elevator algorithms are used? Select one: a. b. c. d.

62 54 144 60

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Of the three components of access time in a movable-head Disk Arm Scheduling Algorithms, ------------ is the longest. Select one: a. b. c. d.

Delay time Search time Seek time Transfer time

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------- control the transfer of information between the disk drives and the rest of the computer system. Select one: a. b. c. d.

System controllers Disk drive controllers Disk drive interfaces System interfaces

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  I/O software is typically organized in four layers as following

Select one: a. Program counter handlers, device drivers, device-independent operating system software, user-level I/O software b. Interrupt handlers, handlers, system-level system-level I/O software, software, device-independent device-independent operating operating system software, user-level I/O software c. Interrupt handlers, handlers, device device drivers, drivers, device-independe device-independent nt operating operating system software, user-level I/O software d. Interrupt handlers, handlers, device device drivers, device-indepe device-independent ndent operating operating system software, software, system-level I/O software  ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  ------------ devices are assigned to only one job at a time. Select one: a. b. c. d.

Static Dedicated Shared Virtual

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which one is not a property of a precise interrupt? Select one: a. b. c. d.

No instruction beyond the one pointed to by the PC has been executed The execution execution state of the the instruction pointed to by the PC is known All instructions before the one pointed to by the PC have partially executed The PC (Program Counter) is saved in a known place

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which DVD format provides the largest storage capacity? Select one: a. b. c. d.

Dual-layer, single-sided single-s ided Single-layer, Single-layer , single-sided Single-layer, Single-layer , double-sided Dual-layer, double-sided

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Mapping all the control registers into the memory space allows ------------Select one: a. b. c. d.

The CPU to communicate with the control register and the device data buffers Processes to communicate communicate with their threads threads Processes to communicate with other processes The CPU to communicate with the RAM memory and processes

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______ 

Quiz 01 CN Which of the following can not a host ? Select one: a. b. c. d.

PDA Computer Router  Smartphone

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which layer interprets the meaning of data? Select one: a. b. c. d.

Presentation Session Data link Transport

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which method is not about switching? Select one: a. b. c. d.

Frequency Division Multiplexing Packet Switching Transmission Rate Time Division Multiplexing

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What statement is incorrect about protocols? Select one: a. b. c. d.

Protocols define define order of of messages messages in network All communication communicat ion activity in network governed by protocols Protocols define format of of messages messages in in network network Protocols define communication between a human to another human

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is the reason that UDP is best effort data delivery protocol? protocol? Select one: a. b. c. d.

UDP try to send packets as fast as it can UDP does not setup the connection before sending messages All of the others UDP sends packets without checking whether whether the packets arrives to the receiver or not

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ____________________ ________________  ______  Two main elements related to network-core functions are

Select one: a. b. c. d.

Forwarding table and queueing algorithm Output link link algorithm algorithm and forwarding algorithm Routing algorithm and forwarding table Routing algorithm and queueing algorithm

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Store and forward technique that entire packet must arrive at router before it can be transmitted on next link exists in Select one: a. b. c. d.

Circuit switching None of circuit switching and package package switching switching Both of circuit switching and package switching Package switching

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The fourth layer in OSI network model is ---------Select one: a. b. c. d.

Transport Application Network Session

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In the transmission delay calculation t = L/R, what is R? Select one: a. b. c. d.

Link bandwidth of the link Time to process at router Speed of switching Propagation speed in medium

 ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  The data that the t he Network layer processes is called --------Select one: a. b. c. d.

Segment Frame Message Datagram

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is maximum data rate for fiber cable? Select one: a. 100Gbps

b. 10Gbps c. 100Mbps d. 1Gbps  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Sources of packet delay does not include Select one: a. b. c. d.

Processing time at node Waiting time on loss Propagation time on medium Waiting time in buffer

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In OSI model, as data packet moves from the lower to t he upper layer header are --------Select one: a. b. c. d.

Added Modified Removed Rearranged

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Network protocols define Select one: a. b. c. d.

Connection configuration and message message order between between network network entities Routing information informatio n and algorithm in networks Message format and action taken taken on message transmission Communication Communication link link configuration configuration and packet forwarding

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Packet loss and delay are usually caused by Select one: a. b. c. d.

Low packet packet arrival arrival rate and and small output link link capacity capacity High packet arrival rate and and large output link capacity Low packet arrival arrival rate and large large output output link link capacity capacity High packet arrival rate and and small output link capacity

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______ 

Quiz 02 CN ------------ is a protocol to transfer file to / from remote host using client / server model. Select one: a. FTP b. HTTP c. SSH

d. Telnet  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------- is a protocol to deliver / store email to / on receiver‟s server. Select one: a. b. c. d.

SMTP IMAP HTTP POP3

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is the characteristic of a network application? Select one: a. b. c. d.

Connect routers to end systems. Run on routers. Help routers find end systems. Run on end systems.

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------ is an HTTP method that allows users to upload input data to server. Select one: a. b. c. d.

DOWNLOAD method POST method SHOW method GET method

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of the following is hybrid of client-server and P2P? Select one: a. b. c. d. e.

Skype EBay DNS BitTorrent Telnet

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   A DNS query resolution resolution mechanism mechanism that repeatedly repeatedly sends a query to different different servers is referred to as -----------Select one: a. b. c. d.

Semantic query resolution Iterated query resolution Keyword query resolution Recursive query resolution

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which statement is incorrect about peer-to-peer (P2P) networks? Select one: a. b. c. d.

Peers directly connect to all other peers in a P2P network Peers can join and leave a P2P network network arbitrarily File distribution distribution on a P2P network network is faster than than on a client-server client-server network network Peers can play roles of server and client in a P2P network

 ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  How does the HTTP protocol implement caching? caching? Select one: a. b. c. d. e.

Using proxy server Using cookie Using hidden input Using client cache Using the If-modified-since If-modified-since header

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What can be used to identify the process? Select one: a. Both IP address address of the host host running the process and the port port associated with that process. b. Process ID assigned by server c. Name of the application running on the host d. Port associated with that process  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is the protocol used to obtain email from / to an email server? Select one: a. b. c. d.

IMAP SNMP SMTP IGMP

 ___________________  _________ ___________________ ___________________ ___________________ __________________ ___________________ _________________  _______  The ---------------- that together implement the DNS distributed database, store -----------------for the hostname to IP address mappings. Select one: a. b. c. d. e.

Root servers ------------ IP address Root servers servers ----------------------- IP address and post post number number Authoritative servers ------------ Entries Name servers --------- Resource Records Resource Records ------------- Name servers

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   Assume the RTT 200ms, 200ms, the transmission transmission time of a Web object object 10ms, how long does it take take to download that object from a Web server to a client if using non-persistent non-persistent HTTP? Select one: a. b. c. d. e.

210ms 240ms 420ms 410ms 220ms

 ___________________  _________ ___________________ ___________________ ____________________ ___________________ __________________ ________________  _______  For what is a Telnet client used? Select one: a. b. c. d.

To see the endpoints endpoints of your your sessions sessions To see your IP address address and configuration details To see the route an IP packet packet takes across multiple multiple routers routers To issue commands to a remote server

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  The client-server model significantly relies on -------------- infrastructure servers, the Peer-toPeer model, instead, pairs of interminably connected peers, communicates ------------ with each other Select one: a. b. c. d.

Usually-off ----------- directly Always-off ----------- indirectly Always-on ----------- directly Usually-on ----------- directly

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What happen when you can connect to the FTP server by typing “telnet 112.158.25.4.21” but you can not connect to the same FTP server by typing “telnet ftp.example.com 21”? Select one: a. b. c. d.

No DNS configuration ADSL connection connecti on has problem All of the others. Server is shutdown

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   Assume a website website has only 5 different different small images, images, using persistent persistent HTTP, a client needs needs --------- to be server Select one: a. 4 UDP connections b. A single TCP connection c. Multiple TCP connections

d. 4 TCP connections connections  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which two protocols are used to control the transfer of web resources from a web server to a client browser? Select one: a. b. c. d.

FTP, HTTP ASP, HTML HTTP, HTTPS HTML, HTTP

Quiz 03 CN RDT can be applicable with supporting of --------Select one: a. b. c. d.

UDP GBN FSM TCP

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  ------------ applications typically use ----------Select one: a. b. c. d.

Elastic ------ DNS Loss-tolerant ------- UDP Loss-tolerant ------- TCP Elastic ------- HTTP

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Chose the application(s) where UDP protocol can be used? Select one or more: a. b. c. d.

Web DNS  Audio stream Video stream

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which three features allow TCP to reliably and accurately track the transmission of data from source to destination? Select one: a. b. c. d.

Encapsulation, Encapsulation, session session establishment, establishment, best best effort effort delivery delivery None of the others Flow control, session establishment, establishme nt, numbering and sequencing Encapsulation, Encapsulation, flow control, connectionless connectionless services services

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is the purpose of checksum code in UDP segment header? Select one: a. b. c. d.

To verify error in protocol‟s segment To verify error in header To verify error in datagram To verify verify error in IP address address

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is purpose of port in IP address? Select one: a. b. c. d.

To determine what is destination process socket at destination host To determine what channel is used at destination host To know what memory is used at destination host To determine what cable is used at destination host

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Multiplexing Multiplexing is capability of Transport Layer to -------------Select one: a. b. c. d.

Forward socket‟s packages through Handle one socket‟s package to send Handle multiple socket‟s packages to send Split socket‟s packages to send

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What are main different aspects between Transport Layer and Network Layer? Select one: a. b. c. d.

Physical communication Logical communication Target objects in communication communication Destination Destinati on host in communication communicati on

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  How many basic protocols supported by Transport Layer? Select one: a. b. c. d.

1 3 4 2

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which statement is correct about protocols in Transport Layer? Select one:

a. b. c. d.

UCP is connectionless connectionless transport transport protocol TCP is is connectionless connectionless transport transport protocol TCP is connection-oriented connection-oriented transport protocol UCP is connection-oriented connection-oriented transport protocol

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Host A and B are communicating over a TCP connection, host A sends to host B t he first segment with size 105 bytes, sequence number 600, the source port 1028, the destination port 80. What is the ACK number, the source port number, the destination port number in the  ACK segment sent sent by host B to host A? Select one: a. b. c. d.

ACK ACK ACK ACK

number: number: 700, source port: port: 80, destination destination port: 1028 number: number: 705, source port: port: 80, destination destination port: port: 1028 number: number: 705, 705, source source port: 1028, destination destination port: 80 number: number: 706, source port: port: 1028, destination destination port: 80

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What is a disadvantage of using a connection-oriented protocol such as TCP ? Select one: a. Packet acknowledgement may add overhead. b. The application layer must assume responsibility for correct sequencing of the data packets. c. Loss or duplication of data packets is more likely likely to occur. occur. d. All of the others  ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In Congestion avoidance of TCP flow control, if timeout occurs while the current congestion window size is 16, t he congestion window will -----------Select one: a. b. c. d.

Reduce Reduce Reduce Remain

to 1 to 8 to 0 16

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In Reliable Data Transfer 3.0, given 1 Gbps link, 15 ms prop, delay, 16000 bit packet, calculate Usender Select one: a. b. c. d.

0.0027 0.0053 0.00027 0.00533

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______ 

Quiz 04 CN Which one is NOT an IP address ? Select one: a. b. c. d.

235.222.1.1 30.80.80.80 54.258.255.1 90.190.200.0

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  How “big” is an IPv6 Internet address? Select one: a. b. c. d. e.

20 octets 32 bytes 128 bytes 128 bits 32 bits

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What information in IP header is used to route packet in router? Select one: a. b. c. d.

Destination Address field Destination Destinati on Address and Source Address fields Destination Address, Source Address, and Protocol f ields Source Address field

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______   A ----------- routing routing table is updated periodically periodically using one of of the adaptive routing routing protocols. Select one: a. b. c. d.

Hierarchical Static Dynamic Deterministic

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which statement is correct about router? Select one: a. b. c. d.

All interfaces have the same same IP address. address. Interfaces does does not not have IP addresses addresses at at all. Each interface to have have a routing table. Each interface to have an unique IP address.

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  In IP Header, HL field value of decimal 10 means ----------.

Select one: a. b. c. d. e.

There are 10 10 bytes bytes in the header. header. None of the above. There are 40 bytes of options. There are 40 bytes in the header. There are 10 bytes of options. options.

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  What does the “time-to“time-to-live” live” field (8 bits) do in an IP header? Select one: a. b. c. d. e.

Sets frame priority Prevents infinite looping Records the transmission transmission time for tracert tracert functions functions Error checking Frame sequence numbering

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  When you use the ping command to send ICMP message across a network, what‟s the request / reply pair you will see? Select one: a. b. c. d.

SYN request and ACK reply Echo off and Echo on ICMP hold and ICMP send Echo request and Echo reply

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  If the fragment offset has a value of 100 and fragment flag=0, it means that -------. Select one: a. b. c. d. e.

None of the above. The datagram has not been fragmented. fragment ed. The datagram is 100 100 bytes in size. This is the last fragment. The first byte of of the datagram is byte byte 100.

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______  Which of the following is a private IP address? Select one: a. b. c. d. e.

12.0.0.1 172.20.14.36 168.172.19.39 190.168.0.2 172.33.194.30

 ___________________  _________ ___________________ ___________________ ___________________ ___________________ ___________________ ________________  _______