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Descrição: Huawei Datacom
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MITRC REFRESHER COURSE 1.
2.
ANSWER KEY
Redundancy means the ________ a. Transmission rate of the system b. Symbols are to be repeated c. Time between failures d. Time between successes
The input signal is a binary digital signal and a limited number of out put phases are possible. a. PSK b. FSK c. QAM d. ASK
4.
A radio channel is composed of ___VB channels. a. 1800 b. 900 c. 10800 d. 8064
5.
What equation defines the composition of an ISDN basic access line? a. 2B + D b. B + D c. B + 2D d. 2B + 2D
7.
8.
9.
a. b. c. d.
10 Mbps 20 Mbps 30 Mbps 40 Mbps
12. Use of coaxial cables in interconnecting networks is limited to an overall length of __. a. 1500 ft b. 1500 m c. 1500 km d. 1500 kft
The digital information is contained in both the amplitude and phase of the modulated carrier. a. PSK b. FSK c. QAM d. ASK
3.
6.
Datacom & Digital Telephon Telephony y
13. What identifies how the stations are interconnected in a network? a. Topology b. Architecture c. Topology or architecture d. Topology and architecture 14. _______is a da ta communication s network designed to provide two-way communications between a large varieties of data communication terminal equipment within a relatively small geographic area a. Private Area network b. Local Area Network c. Wide area network d. Ethernet 15. ______ is the mod e of transmission in p ublic data network in which data are transferred from source to the network then to the destination in an asynchronous data format a. Synchronous mode b. Start/stop mode c. Packet mode d. Circuit mode
A digital network where voice, video, text and data are multiplied into a single network for processing and are transmitted prior to use. a. Frame delay b. Asynchronous transfer mode (ATM) c. ISDN d. Synchronous digital hierarchy(SDH)
16. A seven digit character can represent one of______ possibilities. a. 7 b. 14 c. 64 d. 128
Non-ISDN equivalent can be connected to ISDN line by the use of ____. a. Terminal equipment b. Terminal adapter c. Modem d. Network adaptor
17. ______ is define d to be the maximum rate at which informatio n can be transmitted through a channel. a. Bit rate b. Baud rate c. Coding d. Channel capacity
A special voice encoder/decoder used in digitizing speech signal only is a. PCM b. PWM c. Vocoder d. PFM
18. Who developed the fixed-length binary code for telegraphy? a. Samuel Morse b. Emile Baudot c. Alexander Graham Bell d. Guglielmo Marconi
Equation used to determine the number of Hamming bits in the hamming code. a. 2n = m+ n +1 b. 2n > m +n +1 c. 2n > m +n +1 d. 2n < m +n +1
19. Inventor of pulse-code modulation for the digital encoding of speech signals. a. R.V.L. Hartley b. J.R. carson c. H. Nyquist d. Alex Reeves
10. What determine which network configuration is most appropriate? a. Application layer b. Presentation layer c. Network layer d. Data link layer
20. Serial binary data interchange between DTE and DCE at rates up to 20 kbps. RS 232 is its EIA equivalent. a. V.26 b. V.24 c. V.42 d. V.32
11. Ethernet is a baseband system using CSMA/CD operating at ____ 1
MITRC REFRESHER COURSE
Datacom & Digital Telephony
21. RS 232 is normally an interface between DTE and DCE. What is its signal rate? a. 20 kbps b. 30 kbps c. 40 kbps d. 50 kbps
32. PCM system require_________. a. Analog signal b. Large bandwidth c. Digital signals d. Fiber optics cable 33. Which theorem sets the limit on the maximum capacity of a channel with a given noise level? a. Nyquist theorem b. Hartley theorem c. Shannon-Hartley theorem d. Shannon theorem
22. What is multiplexing? a. The process of increasing bandwidth on a channel b. A technique that enables more than one data source to share the use of a common line c. Mailing letter at the post office d. The ability to share frequency by time
34. _______is the difference between the original and reconstructed signal. a. Quantizing noise b. Fade margin c. Noise margin d. Noise figure
23. In ____ modulation the carrier is a periodic train pulses. a. Amplitude b. Analog c. Digital d. Pulse 24. Which of the following pulse modulation techniques is a digital transmission system? a. Pulse duration modulation b. Pulse position modulation c. Pulse width modulation d. Pulse code modulation
35. What are the steps to follow to produce a PCM signal? a. Sampling,coding and quantizing b. Sampling,quantizing and coding c. Quantizing,sampling and coding d. Coding, quantizing and sampling 36. ________ identifies how the different stations in a multipoint system are interconnected. a. Network topology b. Star network c. Ring topology d. Bus network
25. A process where the higher amplitude analog signals are compressed prior to transmission then expanded at the receiver. a. Compressing b. Expanding c. Encoding d. Companding
37. A transmission where data are inputted directly on the cable. a. Broadband b. Base band c. Digital d. Analog
26. _______uses a single bit PCM code to achieve a digital transmission of analog signal a. Quadrature Amplitude Modulation b. Frequency Shift Keying(FSK) c. Delta Modulation(DM) d. Phase Modulation(PM)
38. Synchronous modems cost more than asynchronous modems because a. They are larger b. They must contain clock recovery circuits c. The production volume is larger d. They must operate on a larger bandwidth
27. The line speed of bell system T1 carrier system is a. 64 kbps b. 3.152 Mbps c. 1.544 Mbps d. 6.312 Mbps 28. How many channels does a super group have? a. 60 b. 600 c. 1800 d. 10800
39. When one station is designated as master and the rest of the stations are considered slaves, message handling is _______. a. store and forward b. polling c. CSMA/CD d. Token passing
29. The output frequency at the channel combiner of channel 7 is a. 76 – 80 kHz b. 80 – 84 kHz c. 84 – 88 kHz d. 88 – 92 kHz
40. A store and forward switching. a. Circuit switching b. Packet switching c. Message switching d. PSTN
30. ________was the first fixed length 5 -bit character code. a. EBCDIC b. ASCII c. Morse code d. Baudot code
41. A timing signal generated by an oscillating circuit that is used to synchronize data transmission. a. Clock b. Start bit c. Quantizing d. BCC
31. Amplitude shift keying is also known as ______. a. Up/down keying b. On/off keying c. Front/back keying d. I/O keying
42. Which system allows different types of networks to be linked together? a. OSI b. CCITT 2
MITRC REFRESHER COURSE c. d.
ANSWER KEY
Datacom & Digital Telephon Telephony y
Bell System AT & T
53. How many bits are there to present 8 combinations? a. 3 b. 4 c. 2 d. 5
43. A _____ that interconnects LAN having identical protocols at the physical and data link layers. a. Bridge b. Router c. Gateway d. Hub
54. How many number of equiprobable events are there for 8-bits of information? a. 256 b. 132 c. 2400 d. 512
44. A _____ that interconnects LAN that has totally different protocols and format a. Bridge b. Router c. Gateway d. Hub
55. Which character code is used without parity bit? a. CCITT number 2 b. ASCCII c. CCITT number 5 d. EBCDIC
45. All bits in a character can be sent/received simultaneously. a. Serial data b. Parallel data c. Full duplex d. Half duplex
56. The percentage of bit errors relative to a specific number of bits received; usually expressed as a number referenced to a power of ten. a. Bit error rate b. Transmission rate c. Distortion d. Parity check
46. A system that perform parallel-to-series conversion of a data link. a. DTE b. DCE c. Modem d. FEP
57. The process of one type of device imitating another via a hardware/software package. a. Conversion b. Emulation c. Imitation d. Simultation
47. Which mode of transmission achieves less than full-duplex but more than half-duplex. a. Full/full duplex b. Echoplex c. Isochronous d. synchronous
58. A digital modulation technique that results in two different frequencies representing binary 1 and 0. a. FSK b. QPSK c. ASK d. DPSK
48. Rules governing the transmission of digital information. a. Data communications standard b. Line protocol c. Isochronous d. Digital communications
59. One dit is equal to _____ bits. a. 3 b. 3.5 c. 3.32 d. 4
49. Codes must be a. Eight bits per character b. Either seven or eight bits per character c. Agreed upon in advance between sender and receiver d. The same in all modem computers
60. A quadratic signaling has _____ possible states. a. 16 b. 4 c. 8 d. 32
50. Clear to send is a signal passed from the local modem to the local terminal when data port is ready to transmit data. It usually occurs in response to a. Data set ready b. Request to send c. Data terminal ready d. Data carrier detect
61. What is the smallest unit of information in binary transmission system? a. Byte b. Digit c. Bit d. Nibble
51. Digital to analog converter in synchronous modems send signals to the a. Modulator b. Transmission lines c. Terminal d. equalizer
62. The lowest layer in the ISO protocol hierarchy. a. network layer b. physical layer c. transport laye d. datalink layer
52. What is the data rate of the ISDN Basic access B channel? a. 32 kbps b. 64 kbps c. 144 kbps d. 192 kbps
63. Modem is referred to as a. Universal asynchronous receiver transmitter b. Universal synchronous receiver transmitter c. Data terminal equipment d. Data communication equipment 3
MITRC REFRESHER COURSE
Datacom & Digital Telephony
64. A signaling method relating to a multiplicity of circuits is conveyed over a single channel b y labeled messages. a. code signaling b. syncronous c. common channel signaling d. asynchronous
c. d.
ASCII HOLLERITH
75. Equipment that interfaces the data terminal equipment to the analog transmission line. a. Modem b. Muldem c. Multiplexer d. Codec
65. ______ is a network operating system within several buildings in compound. a. Internet b. Novell netware c. 10BASE-t d. intranet
76. A communication network design for transferring data from one point to another a. Public Telephone network b. Public Data network c. Value Added Network d. Packet Switching network
66. What is the Nyquist sample rate for a voice input of 10 kHz? a. 10 kHz b. 20 kHz c. 30 kHz d. 40 kHz
77. A conceptual network in which all transmission lines handle digital or digitalized data. a. LAN b. WAN c. ISDN d. PSTN
67. What is the minimum number of bits required in PCM code for a range of 10,000? a. 12 b. 9 c. 14 d. 8
78. A data communications component that provides control or supporting services for other computers, terminals, or devices in a network. a. Host b. Communication controller c. Cluster controller d. Interface equipment
68. How many levels can be represented in PCM transmission system if the binary numbers 00000000 to11111111 are used to represent signal levels? a. 256 b. 64 c. 128 d. 512
79. Which data network configuration let computers share their resources? a. Peer to peer b. Hierarchical c. PVC d. LAN
69. A symbol to represent a data communications facility within the wide area network. a. Hub b. Cloud c. Server d. Gateway
80. A means of improving the quality of a private-line circuit by adding amplifiers and equalizer to it. a. Line equalizer b. Line amplifying c. Line conditioning d. Line encoding
70. All bits in a character are sent and received _____ in serial port. a. One at a time b. Simultaneously c. In group of 2 bits d. In group of 3 bits
81. Direct distance dialing (DDD) network is commonly called a. Private-line network b. PT network c. Dial-up network d. Trunk network
71. Message switching is ____ network. a. Hold and forward b. Forward c. Hold d. Store and forward
82. A type of server that allows multiple users to take advantage of a single printing device. a. Print b. Client c. Network d. File
72. Packet switching is _____ network a. Hold and forward b. Forward c. Hold d. Store and forward
83. _____ ensures that the transmitter and the r eceiver agree on a prescribed time slot for the occurrence of a bit. a. Bit or clock synchronization b. Modem or carrier synchronization c. Character synchronization d. Message synchronization
73. Polling is an invitation by the primary to secondary equipment to ____ a message. a. Store b. Receive c. Transmit d. Read
84. Characters that must be transmitted other than data are called a. Parity b. Error
74. An 8-bit character code. a. EBCDIC b. BAUDOT 4
MITRC REFRESHER COURSE c. d.
ANSWER KEY
Datacom & Digital Telephon Telephony y
Overhead Hamming bits
c. d.
85. The generating power polynomial x7 + x5 + x4 + x2 + x1 + x is equivalent a. 101101110 b. 101101111 c. 010010001 d. 10110111
Star Tree
96. What is the most widely used data communications code? a. Gray b. EBCDIC c. Baudot d. ASCII 97. Mark and space refer respectively to a. 1 and 0 b. Dot and dash c. Message and interval d. On and off 98. What is the other name for parity? a. BCC b. LRC c. VRC d. CRC
86. A central device into which each node of a star network is directly connected a. Hub b. Central pointer c. Router d. Repeater 87. To ____ is to send a file to a remote computer. a. Upload b. Download c. Call d. Transmit
99. A device that performs routing functions and protocol translation from one network to another. a. Gateway b. Bridge c. Router d. Repeater
88. A microcomputer attached to a network requires a a. NIC b. RS 232 c. Software d. Protocol
100. Not important characteristic of the physical layer a. Electrical b. Mechanical c. Logical d. All of them
89. Digital telephones and integrated voice-data workstations are examples of what type of ISDN equipment? a. TE b. TA c. NT2 d. TP
.
90. How many OSI layers are covered under the X.25 standard? a. 3 b. 4 c. 7 d. 2 91. With _____, a station monitors the line to determine if the line is busy. a. CSMA/CD b. CSMA/CA c. Token Passing d. PDDI 92. CCITT standard concentrating on data communications over the telephone network. a. V series b. X series c. I series d. T series 93. Broadband uses a. TDM b. Space multiplexing c. FDM d. Statistical multiplexing 94. _____ uses the connecting medium as a single-channel device. a. Broadband transmission b. Digital transmission c. Base band transmission d. Analog transmission 95. Which is considered as the fastest LAN topology? a. Ring b. Bus 5
