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Implementing Cisco Networking Solutions by Harpreet Singh

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Layer 3 - The network layer

The basic service of the network layer is to provide the transparent transfer of datagrams between the transport layers at the two nodes. This layer is also responsible for finding the right intermediate nodes that might be required to send data to the destination node, if the destination node is not on the same network as the source node. This layer also breaks down datagrams into smaller fragments, if the underlying datalink layer is not capable of handling the datagram that is offered to the network layer for transport on the network.

A fundamental concept in the OSI stack is that data should be passed to a higher layer at the receiving node as it was handed over to the lower layers by the transmitting peer. ...

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