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WAN Technologies  
 
 

WAN( Wide Area Network) WAN is a data communications network that covers a relatively broad geographic area using private or public network transports and often uses transmission facilities provided by common carriers, such as telephone companies. WAN technologies function at the lower three layers of the OSI reference model the physical layer, the data link layer, and the network layer.

WAN is a communication network made up of computers that are non-local to one another, exchanging data across a wide area or great distance. WANs are used to connect LANs and other types of networks together, so that users and computers in one location can communicate with users and computers in other locations. . The most common example is the Internet, though a WAN need not be global to qualify as a wide area network. The Internet can be considered a WAN as well, and is used by businesses, governments, organizations, and individuals.


Types WAN Technologies Connections are

Point-to-Point technologies (Point-to-Point technologies are leased from a service provider, and provide guaranteed bandwidth from location to another)

Circuit-switched technologies ( A method in which a dedicated physical circuit is established, maintained, and terminated through a carrier network for each communication session)

Packet-switched technologies (method in which network devices share a single point-to-point link to transport packets from a source to a destination across a carrier network)

 

WAN Technologies Characteristics are

1. Connection duration

2. Switching

3. Synchronization mechanism

4. Data rate

5. Termination

6. Transmission media

7. Multimode

8. Single mode

 

Key technologies of WAN include

1.SONET (Synchronous Optical Network is an international standard for high speed    communication over fiber-optic networks)

2. Frame Relay (A high-speed packet-switched data communications service, Frame relay   is widely used for LAN-to-LAN interconnect services, and is well suited to the busty    demands of LAN environments.)

3. X.25 (The X.25 protocol allows computers on different public networks to communicate     through an intermediary computer at the network layer level.)

4. ATM (A dedicated-connection switching technology that organizes digital data into 53-byte    cell units. Individually, a cell is processed asynchronously relative to other related cells and    is queued before being multiplexed over the transmission path)

 

 
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