help3002

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help3002

This forum is provided to promote discussion amongst students enrolled in CITS3002 Computer Networks.

Please consider offering answers and suggestions to help other students! And if you fix a problem by following a suggestion here, it would be great if other interested students could see a short "Great, fixed it!" followup message. How do I ask a good question?

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UWA week 15 (1st semester, week 6) ↓

Mid sem Q (all 4)

11:26am Mon 8th Apr, Christopher M.

ANONYMOUS wrote:

> not sure if your answer already covers this but, like you said the network layer deals with routing of packets. Since packets may take different routes to reach a destination (through different routers) the packets need to be numbered so that at the destination they can be re-assembled

This is the strongest answer of all the points made, above. Consider *who* the sequence numbers are for: - in a DataLink Layer protocol, they're for 2 directly connected node - in a Network Layer protocol, they're for 2 nodes possibly many hops apart. If a single physical link (wire) is on the path between multiple pairs of remote nodes, then the traffic crossing that wire will use sequence numbers to control/manage/describe each frame crossing the wire, and each frame will be carrying (in its payload) the NL sequence numbers for each of the many pairs of remote nodee.