Router

A router is a device that interconnects with two or more computer networks, and selectively interchanges packets of data between them. Each data packet contains address information that a router can be use to determine if the source and destination are on the same network, or if the data packet must be transferred from one network to the another. Where multiple routers are being used in a large collection of interconnected networks, the routers exchange information about target system addresses, so that each router can build up a table showing the preferred paths between any two systems on the interconnected networks.

A router is a networking device whose software and hardware are customized with the tasks of routing and forwarding information. A router has two or more set of network interfaces, which may be to different physical types of network (such as copper cables, fiber, or wireless) or different network standards. Each network interface is a small computer specialized to convert electric signals from one form to another.

Routers connect two or more logical subnets, which do not share a common network address. The subnets in the router do not necessarily map one-to-one to the physical interfaces of the router. The term "layer 3 switching" is used often interchangeably with the term "routing". The term switching is generally used to refer to data forwarding between two network devices that share a common network address. This is also called layer 2 switching or LAN switching.

Types of routers

* Edge Router:.
* Subscriber Edge Router
* Inter-provider Border Router
*Core router.


Router Manufacturers

The major router manufacturers include:

* Cisco Systems
* D-link
* Juniper Networks
* Brocade
* Alcatel-Lucent
* Fujitsu
* Huawei
* ZTE
* Extreme Networks
* UTStarcom

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