WAN Technologies

Features of WAN

WAN is a network that spread over large geographical area. It uses several technologies to get that connectivity over vast area. From that connectivity we can have lot features in WAN. They are,

Circuit switching

Packet switching

Lease line

X.25

Frame relay

ATM

Circuit switching

Circuit switching involves creating a direct physical connection between sender and receiver. The connection must be set up before any communication can occur. A circuit-switched network is one that establishes a dedicated circuit (or channel) between nodes and terminals before the users may communicate. 

Circuit switching

The sender and receiver can count on "owning" the bandwidth allotted to them for as long as they remain connected.

Packet switching

Packet switching is a WAN technology in which users share common carrier resources. Packet-switched describes the type of network in which relatively small units of data called packets are routed through a network based on the destination address contained within each packet. Packet Switching allows the same data path to be shared among many users in the network.

 

Packet Switching

 

The packet passes from exchange to exchange for delivery through the provider network. This data packets change the path dynamically. According to the traffic it changes the path.

Lease line

Lease line is used to provide point-to-point dedicated network connectivity. Analog leased line can provide maximum bandwidth of 9.6 Kbps. Digital leased lines can provide bandwidths: 64 Kbps, 2 Mbps (E1), 8 Mbps (E2), 34 Mbps (E3) ... Internet lease line is used to access internet with dedicate bandwidth.

X.25

X.25 Defines a telephone network for data communications. It provides users with WAN connectivity across public data networks (TELENET, TYMNET). Developed by common carriers to increase subscription to PDNs. Specification defines a point-to-point interaction between DTEs and DCEs for remote access terminals and computers.

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