Liban, Denise Lyka Allyza G. 2 NUR-5 September 2, 2015Router

Router is such a device, used in computer networking. Router works on layer 3 (Network Layer). It forwards the packet on the basis of Routed Protocols such as IP, IPv6, IPX etc. The Router is generally used to communicate between two or more than two different networks or LAN. It means If you have two identical LAN, established in two different locations such as main building to our building. You can connect them through router!

MAIN FUNCTION OF ROUTER

1. Packet Forwarding: Router maintains a routing table for all possible networks that can be reached.  In the routing table, a router maintains subnet, Gateway, forwarding interface, timing etc. of the destination network. If multiple paths exist to reach the destination network, only best path is maintained in the routing table. Once any packet is received, it checks the destination IP network in the routing table. If destination network is available in routing table, It forwards the packet otherwise it drops.

2. Packet Switching: To move packets from one interface to another to send the packet to its destination.3. Packet Filtering: acket filtering is such like firewall. By which you can define which network can be entered and which network can be dropped. In easy word, It filters the packet on the basis of IP address, subnet, port no and protocols.

TYPE OF ROUTER.

1. Fixed routers are that type of router which has fixed slots and interfaces such as : 2500 series routers.2. Modular routers are that type of routers which has not fixed slots and interfaces and you can install interface and slot as per your requirement.