7. A All capacities Estimate the mean delay per packet for the network and traffic matrix shown below. when the mean packet length is 750 bits. 20 B A B C D E 6 4 7 2 AB ABC AD ADE 20 in kbits/sec. 3 4 2 3 BA BC BD BE 12 15 5 2 4 3 15 CBA CB CED CE 3 2 1 5 12 DA DB DEC DE 15 E E 5 EDA 7 5 3 EB EC ED Repeat the previous example with the traffic matrix given at the end of the tutorial. [Hint - simple example with non-symmetric traffic and routes. 2nd part same again use table in question 11.] 7 One possible mechanism for controlling congestion would be to discard packets if the number of packets in a queue exceeded a certain level. Derive an expression which could be used to estimate the proportion of packets discarded. (Hint - use M/M/1 state diagram) [Hint-look at proof in notes and see what we did for Erlang equations - not a lot of maths. Not really derive as I have done that already-just "find"]