A router may be a network device that connects different pc networks by routing packets from one network to the opposite. This device is typically connected to 2 or a lot of different networks. once a data packet comes to a router port, the router reads the address info in the packet to determine out that port the packet are sent. as an example, a router provides you with the net access by connecting your computer network with the net.

A router is considered a Layer three device of the OSI model as a result of its primary forwarding decision is based on the data of the OSI Layer three (the destination ip address). If 2 hosts from completely different networks need to speak with one another, they’ll would like a router between them. consider the following example:

We have a network of 3 computers. Note that every pc is on a different network. Host A desires to communicate with Host B and sends a packet with Host B’s ip address ( to the default gateway (the router). The router receives the packet, compares the packet’s destination ip address to the entries in its routing table and finds a match. It then sends the packet out the interface related to that network. only Host B can receive the packet. In fact, Host C won’t even remember that the communication took place.


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