Router

Router is a networking device which connects two or more different sub networks. The main function of the router is to show the optimum path for ip packets to reach its destination. This is done by the help of routing table stored inside of a router based on which decides the path for the packets to reach its destination. A computer can also act as a router if proper software in its has been configured. Router acts in network layer of the TCP/IP model. Cisco and Juniper are the major companies which produces router. Routers can also be treated as firewall by defining proper access list inside the router one can block unwanted access to the network. Routers use different protocols in order to trace the path from source to destination. The routing protocols that are being widely popular are RIP, OSPF, IGRP,EIGRP, BGP etc.