OSI Model: Network Layer and its Function

Network layer is the layer 3 of OSI reference model. Network layer is responsible to deliver packets from source to destination across multiple networks (links). We have already learnt about data link layer that it delivers the packets between computers in same network. But, when we have to transfer packets across multiple networks, then network layer comes in need.

At the sender side, network layer breaks larger packets into small packets and at the receiver side, network layer assembles packets for higher layers. 

Functions of Network Layer

1. Network layer handles logical addressing. Logical address is IP address used for the purpose of routing.

2. Transfers packets from source to destination hosts.

3. In a network of networks, devices routes the packets to its destination. Network layer helps in routing, connecting devices such as routers work at this layer.

4. It provides routing algorithms.