Network Basics

Network ========= It is a group of devices interconnected to each other to share resources among them. A network can be divided into various types they are 1.LAN- Local Area Network 2.MAN- Metro Area Network 3.WAN- Wide Area Network 4.CAN- Campus Area Network 5.PAN- Personel Area Network 1.Local Area Network ====================== This network is confined to a single building or an organization. The components which you are using to create LAN 1.PC 2.NIC/Ethernet Card/LAN Card 3.Cable 4.RJ-45 5.HUB/SWITCH 2.Metro Area Network ==================== A metro area network is confined to city limits. The components which we can use in metro area network 1.WAP - Wireless Access Point 2.Cable Network 3.Wide Area Network ==================== This network is not confine it is through out the world. The components which you are using WAN is 1.Routers 2.ATM Switches

3.Frame Relay Switches 4.ISDN Switches 4.CAN - Campus Area Network ============================= This network is confine to a single university or a college. The components or technology which we are using 1.Wi-Fi 5.PAN ======= This network is confine to the devices which are personel. This network is confine to Mobile to PDA PDA to Labtop The example of this network is BlueTooth Network Characterstics ======================= 1.Speed -Bandwidth of the Network should be more 2.Reliability - Uptime of the network should be high 3.Cost - Cost of the network should be Affordable 4.Security- The network should not contain virus.

Network Applications ===================== 1.Browser

-http

2.Outlook Express

-SMTP,POP

3.Terminal Emulation

-Telnet

4.Messenger 5.Database Appln Network Topology ================= Topology defines how the network designed . That is how the network devi

ces are arranged. There are various types of Topologies which we find. 1.Bus Topology 2.Star Topology 3.Ring Topology 4.Mesh Topology 1.Bus ======== In this kind of Topology all devices are connected to a single media. Collisions will be more in this kind of topology. Single point failure will be occuring in this topology 2.Ring ========= In this kind of Topology all devices are connected to a single media. Collisions will be more in this kind of topology. Single point failure will be occuring in this topology

3.Star ======== In this kind of topology all the systems are connected to a single devic es that is hub or switch. Single point failure will not be there. If a central device fails then only total network goes down.

4.Mesh Topology =============== In a mesh topogly each and every systems is connected with every system of that network. There is not single point failure will be there This is very expensive