Computer Networking

Transport Layer

Types of Computers Network

There are two major types of computers network.  One is LAN and other is WAN. Let explain both these terms

1. LAN

In LAN, group of computers are connected to each other in a small area such as office, building etc.

  • Communication Medium: Twisted pair, coaxial cable, Wi-Fi or Blue-Truth etc.
  • Devices: HUB or Switch
  • Speed: Highest speed (almost 10 Mbps to 1000Mbps) as compare to others Networks.
  • Security: Higher security because limited number of computers in limited range.

Examples: Computer Lab: Almost 20 to 50 computers are connected through LAN.

2. WAN

WAN is much bigger network than the LAN. It covers the large geographical area such as states or countries.

  • Communication Medium: Fiber optic cable, satellite links, telephone lines.
  • Devices: Routers, satellites
  • Speed: 56Kbps to 50 Mbps.
  • Security: Less Secure than LAN.


Internet is the best example of WAN which connects millions of users all over the world to share information’s. Such as

  • ATMs of a bank located in different cities connected through Internet
  • NADRA offices in different cities of Pakistan connected through Internet
  • FB chatting all over the world etc.

Keep in Mind: If the computers in the network are connected through internet then it will be WAN otherwise if the computers are connected without internet then that network may be a LAN, PAN or MAN etc.

Types of LAN

LAN is further categorized into its types

  • PAN(Personal Area Network)
  • MAN(Metropolitan Area Network)
  • Campus Area Network (CAN)
  • Wireless Local Area Network (WLAN)

1.  PAN (Personal Area Network)

  • PAN is a smallest and most basic type of network that connects personal devices by using wired or wireless technology.
  • Personal Area Network covers an area of 30 feet.
  • Wireless PAN is more common than wired PANs. Wireless PANs use Blue-Truth or Wi-Fi technology to connect devices.
  • These devices to form a network may include portable PC, smart phones, digital camera and printer etc.

2. Wireless Local Area Network (WLAN)

WLAN use the  wireless network technology, such as Wi-Fi. This technology rely on Wi-Fi or Blue-Truth instead of physical cabling.

3. Campus Area Network (CAN)

CAN is Larger than LANs, but smaller than MAN. Campus area network can cover several buildings which are fairly close to each other’s.

4. MAN (Metropolitan Area Network)

  • Inter-connecting of two or more LAN’s to form a larger network in known is MAN. It is a network within the city.


  • Cable TV network in a city
  • Connecting of different campus of a company in a same city
  • Network connection of different branches of a company in a same city


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