COMPUTER NETWORKS

 What is Network Layer             *   Network layer is  the third layer in the OSI model of computer networks .             *   It's main function is to transfer network packets from the source to the destination.              *    It is involved both at the source host and the destination host. Network Layer Functions:                Routing :  When a packet reaches the router's input link, the router will move the packets to the router's output link.                 For example, a packet from S1 to R1 must be forwarded to the next router on the path to S2.                Logical Addressing:  The data link layer implements the physical addressing and network layer implements the logical addressing.                      Logical addressing is also used to distinguish between source and destination system. The network layer adds a header to the packet which includes the logical addresses of both the sender and the receiver. Internetworking:  This is the main role of the netw