Sunday, 7 February 2021

Wide Area Network

What is a Wide Area Network?

A Wide Area Network (WAN) is a form of a telecommunication network that connects devices from multiple locations around the globe. This type of network is slightly more complex then LAN. However, it used to connect computers from a long physical distance, in this ROUTER is a must. Therefore with the help of a router, we connect the computer between two states, two countries or two geographical areas is WAN. It uses various links such as Virtual Private Networks (VPNs), Multiprotocol Label Switching (MPLS), and Wireless Cellular. It functions with the three layers of the OSI model they are the physical layer, data link layer, and network layer.

Types of WAN connections

The following types of WAN Connections are

  • Leased line connections
  • Circuit-switched connections
  • Packet-switched connections

Leased Line Connections

It can be called a point-to-point ( dedicated connection ) that provides a single, pre-established WAN communication path. Therefore, it is Synchronous, the synchronous communications involve digital signals that are transmitted with precise clocking. However, its speed T3 is 45 Mbps, and it is very expensive.

Circuit Switching

It provides a dedicated physical circuit, which stays in place between the sender and the receiver for the duration of the communication session. Therefore the telephone company network uses the system to provide basic telephone services or ISDN (Integrated Services Digital Network ) and the basic telephone services are asynchronous serial communication.

Packet Switching

The packet-switching method involves network devices sharing a single point-to-point link. However, the Point-to-point link is used to transport packets from source to destination over a telecommunication carrier network. Therefore the statistically programmed switching devices provide physical connections and packet headers are used to identify the destination and it is less expensive and Synchronous serial lines, its speed T3 is 56 Kbps.

Physical items needed for WAN link

  • Customer Premises Equipment ( CPE )
  • A Demarcation ( DEMARC )
  • A Local loop ( last mile ) – copper wire
  • A central office ( CO ) switch
  • A full network

WAN Protocols

The following WAN protocols are

  • ATM - Asynchronous Transfer Mode
  • HDLC - High-Level Data Link Control
  • SLIP - Serial Line Interface Protocol
  • FR - Frame Relay
  • PPP - Point to Point Protocol
  • ISDN - Integrated Service Digital Network
  • X.25 -  ITU-T standard Protocol Suite
Also Learn about WAN Protocols

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