Wide Area Network

wide area network (WAN) is a telecommunications network that extends over a large geographical area for the primary purpose of computer networkingWide area networks are often established with leased telecommunication circuits.

  • Wider geographical span than a LAN.
  • Spans a town, a state, a country, or even the world.
  • Interconnects connecting devices such as switches, routers, or modems.
  • Normally created and run by communication companies.
  • Point-to-Point WAN.
  • Switched WAN.
  • Internetwork

Point-to-Point WANs

point-to-point wide area network (WAN) consists of two end nodes connected by a leased line. In a typical configuration, a router on the network is connected using a serial transmission interface such as V. … The CSU provides the interface between the router and the telco’s leased line.

Switched WANs

As the name indicates, a switched WAN network is used to connect multiple end nodes through a common WAN network. The end nodes connect to a switched WAN networks to either reach other nodes connected to the switched network or to connect to the public Internet.


Internetworking is the practice of interconnecting multiple networks, such that any pair of hosts in the connected networks can exchange messages irrespective of their hardware-level networking technology. The resulting system of interconnected networks is called an internetwork, or simply an internet.

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