Network Layer - OSI Model
The
main aim of this layer is to deliver packets from source to destination across
multiple links (networks). If two computers (system) are connected on the same
link then there is no need for a network layer. It routes the signal through
different channels to the other end and acts as a network controller.
It
also divides the outgoing messages into packets and to assemble incoming
packets into messages for higher levels.
FUNCTIONS
OF NETWORK LAYER:
1.
It translates logical network address into physical address.
Concerned with circuit, message or packet switching.
2. Routers and gateways operate in the network layer. Mechanism is
provided by Network Layer for routing the packets to final destination.
3. Connection services are provided including network layer flow
control, network layer error control and packet sequence control.
4.
Breaks larger packets into small packets.
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