help3002

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help3002

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UWA week 11 (1st semester, week 3) ↓

labs Lab 2 Topology query (all 4)

3:28pm Thu 14th Mar, Christopher M.

"Cameron Locke" <21*3*2*2@s*u*e*t*u*a*e*u*a*> wrote:

> For Lab 2, STOPANDWAIT2 has a variable called ber, set to 0.00005, is this the probability of frame corruption? If not, how is frame corruption handled in this topology?

It stands for 'bit error rate' - the probability that one-or-more bits in a frame will be corrupted.

> I've managed to get the Negative Acknowledgement working (or at least, when a corrupt frame is identified, it sends one, and the message is resent), but every time a message that has a corrupted frame is noted, the resent message will also be corrupt, and I'm not sure if that's on my end yet.

Yes, there's an additional problem that needs to be solved. It's easy to detect a damaged frame, and send back a negative-acknowledgement, but what needs to happen if that negative-acknowledgement frame is damaged?