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LAN & WAN

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What is meant by LAN?

  • A Local Area network (LAN) is a relatively small localized network used in a home, a company, an institution or a department.
  • LANs often uses cables or radio waves for transmission.
  • A LAN is usually contained within a campus or a building.
  • Owned and maintained by the organization in which the LAN is installed.
  • LANs are relatively inexpensive and are typically faster but the area covered is relatively small compared to WAN.
  • LAN devices: Switches, Repeaters, Hubs & Bridges.
              VLAN concepts

What is meant by WAN?

  • A Wide Area Network (WAN) is nothing but a network of multiple LANs around the world.
  • WANs often use leased lines, telephone or satellite communications.
  • Covers large geographical areas like cities, states, nations etc..
  • Leased to WAN services vendor (ISPs), so it is maintained by the same vendor.
  • WANs are relatively expensive
  • WAN devices: Routers, multilayer switches, Frame relays etc..

2 Types of WAN

  1. Enterprise Network – connects LANs of a single organization.
  2. Global Network – Includes the networks of several organizations. eg. Internet.

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