help3002

It's UWAweek 18 (1st semester, week 9)

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.