Router

=__Router__=

Router is a device that forwars the data to diffrent networks. The routet is connected to one or more data lines, when a data comes in one of the data lines, the router reads the data and finds the address then sends to that address. If the data is not acceptable for example if the data is private like an email that contains bank details the router resends the data. If the data is good to go then the router passes the data on to the other router on the network. A data packet is forwarded to the next router through the networks that constitute the internetwork untill it arrives the destination.

The most familier routers are the home and small office routers that easly pass the data such as web pages and emails between home computers and owner's cable which connects to the internet (ISP). Other hard routers which carries the data package at a high speed has to travel through the optical fibre lines of the internet backbone. When two or more routers are used in the interconnected network, the routers exchange the data till it reaches its destination.

Routers are also used to connect to logic groups of computers knows as the subnets. Each with a different sub- net addresses. The router has two stage of works called planes. Control plane and forwarding plane.


 * Control plane**: A router records a routing table, finding out what route should be used for forwarding the data, and through which interface connection. It does this using internal pre configured address called static routs.

on the header. This is Cisco. Large leading router.
 * Forwarding plane**: The router forwars the data through incoming and outgoing interface connections. It routes it to the correct network using the information

Large businesses need more powerfull routers to cope with ever increasing infranet data traffic. A router is considered as layer 3 device because its primary forwarding option relies on the information of layer 3 IP packet, specifically the IP address. This process is known as routing.