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Unformatted text preview: 16 OSI Model: Network Layer 3. Network Layer While the data link layer oversees the delivery of packets between two devices on the same network, the network layer is responsible for the source-to-destination delivery of packet across multiple networks / links . sender receiver Routing over multiple networks: 1) in min time , AND 2) with min overhead . 17 OSI Model: Network Layer logical addressing : The physical addressing implemented by the data link layer handles the addressing / delivery problem locally over a single wire. If a packet passes the network boundary another addressing system is needed to help distinguish between the source and destination network . routing : The N.L. provides the mechanism for routing/switching packets to their final destination, along the optimal path across a large internetwork. Net 1 Net 5 Net 3 Net 3 Net 2 H Net 3 Net 3 G H H H G G G G G Net 1 Net 1 Net 2 Net 2 Net 4 Net 4 Net 5 Net 5...
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This note was uploaded on 02/14/2012 for the course CSE 3213 taught by Professor A during the Winter '10 term at York University.
- Winter '10