help3002

It's UWAweek 42 (2nd semester, week 12)

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 22 (1st semester, study break) ↓

final exam 2023 Exam Question 1 (all 3)

6:36pm Tue 28th May, ANONYMOUS

Develop an implementation in pseudo-code, with a syntax similar to C, Python, or Java, that simulates the behaviour of the 1-persistent CSMA/CD protocol over 100Mbps Ethernet. The simulation should support N identical nodes, each wishing to transmit a frame to other nodes at random intervals. Assume that Ethernet employs a fixed slot-time, and that collision detection and resolution takes exactly one slot-time. For this exam question, how can you know if binary exponential back-off is used or not, or is it up to us whether or not we implement it?

final exam 2023 Exam Question 1 (all 3)

8:43pm Fri 31st May, Oliver F.

Binary exponential back-off is a part of the standard Ethernet protocol and thus will be implemented I think.

UWA week 23 (1st semester, 1st exam week) ↓

final exam 2023 Exam Question 1 (all 3)

2:14pm Tue 4th Jun, Christopher M.

ANONYMOUS wrote:

> For this exam question, how can you know if binary exponential back-off is used or not, or is it up to us whether or not we implement it?

Yes, your pseudo-code should include an 'implementation' of binary-exponential backoff, as the delays of each node (based on their observations of collisions) will affect when they transmit/retransmit in the future and, thus, affect how the medium is utilised.