What is WAN – Wide Area Network, How WAN works – Types of WAN

What is WAN

As the name symbolizes wide area network is a broad network whose communication is wider than the LAN, MAN and even CAN. The application of WAN (Wide Area Network) is not limited to a room, building or specific vicinity. The basic purpose of Wan is to maintain a number of LAN networks in order to increase the efficiency of the network. Different LAN networks are connected to establish a network which will enable the users of one location to communicate with the users present in the other location. Internet service providers usually help and guide to establish WAN (Wide Area Network) networks. However many large organizations develop their own private WAN’s (Wide Area Network)s .

WAN (Wide Area Network) networks are established often by seeking help from telecomm departments who provide the facility of leased lines. Router is connected to the LAN at one side and a hub is attached at the other end. This is an expensive way of establishing WAN (Wide Area Network) network. WAN (Wide Area Network) networks are often established using circuit switching method. A circuit switching network is established when at the one end a node and on the other end a terminal is physically connected to each other for further communication. The most common physical network nodes are switches, hub and a modem. Whereas a terminal is a physical device that does the basic communication, for example like a telephone, call answering machine or a printer sometimes. The data travels through the use of network protocols. The protocols are the defined rules which guide the information transfer. The purpose of protocols is to detect the errors.

How WAN Works

If we develop a virtual switching network or packet switching network then we often need frame relays to transfer the data within a WAN (Wide Area Network). Frames are data packets which are transferred from one end to the other. There are many types of WAN (Wide Area Network) protocols like TCP/IP, MPLS, frame relays and ATM. Most of the WAN’s (Wide Area Network) however use X.25 is a famous WAN protocol used for packet transfer. X.25 is established with the packet switching exchange, which are the physical nodes at one end and the leased telephones lines at the other end.

Types of WAN (Wide Area Network )

A WAN (Wide Area Network) network can be established in many ways and different types of WAN. Wan can be established using leased lines, circuit switch network, packet switching, frame or packet relay and cell relays. Packet switching is the one of the most common types of establishing a WAN (Wide Area Network) network. In a packet switching method a digital network is established. In this method suitable data blocks are created. These data blocks are known as packets. The data travels in the form of varied bit rate. These bits travel in the form of sequences of packets over the network and their delay is dependent upon the load of traffic over the network.X.25 and frame relays are the most suitable protocols for this kind of network. Leased lines are the other most suitable and quick way to establish a WAN (Wide Area Network). However leased lines are usually not preferred due to their expensive nature. Leased lines help establish a symmetric connection from one point to the other usually this involves an amalgamation of two LANs. When a network is established using a packet switching method. A user usually receives he variable bit rate at its end, because in packet switching the data travels in bits which unite to make varied bit transfer packets. If the purpose of the WAN (Wide Area Network) network is to attain a constant bit rate transfer then cell relay can be used. In this method data is separated in fixed bits to travel over a network. The sample protocol of this sort of data can be ATM. This connection is preferred when we need simultaneous flow of data streams.

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