LAN, MAN AND WAN

 LAN (Local Area Network)

·         Group of interconnected computers within a small area. (room, building, campus)

·         Two or more pc's can from a LAN to share files, folders, printers, applications and other devices.

·         Coaxial or CAT 5 cables are normally used for connections.

·         Due to short distances, errors and noise are minimum.

·         Data transfer rate is 10 to 100 mbps.

    Example: A computer lab in a school.

 

MAN (Metropolitan Area Network)

·         Design to extend over a large area.

·         Connecting number of LAN's to form larger network, so that resources can be shared.

·         Networks can be up to 5 to 50 km.

·         Owned by organization or individual.

·         Data transfer rate is low compare to LAN.

Example: Organization with different branches located in the city.

 

WAN (Wide Area Network)

·         Are country and worldwide network.

·         Contains multiple LAN's and MAN's.

·         Distinguished in terms of geographical range.

·         Uses satellites and microwave relays.

·         Data transfer rate depends upon the ISP provider and varies over the location.

Best example is the internet.

  1. Hub — It is used to connect multiple computers as a single LAN network. The HUBs are available with 4,8,12,24,48 ports.
  2. Switch — It is also a local area network. It connects devices in a single LAN. Switch is an intelligent device; it stores the MAC address table. Unlike hub, switch does unicast it means it can send the data to the exact recipient.
  3. Bridge — It is a device used to connect to different computing devices and also used to divide a large network into smaller segments.
  4. Modem — It is a device that is used to connect with internet using telephone lines. It converts digital signals to analog signals and analog signals to digital signals.
       5.Router — It is a networking device that can connect two or more different LANs that has two or             more different protocols, so one side if it is ethernet another side if it is wifi and router can                     connect these two different technologies as well

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