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Q.2
(a) Suppose that the maximum utilization that can be achieved by a 1 km-long 10 Mbps
CSMA/CD broadcast LAN is 0.8 when 4 hosts are active. What is the throughput
(in Mops) achieved when each of the 4 hosts attempts to transmit during a slot with
probability 0.3? Use the simplified model for the analysis and make necessary
assumptions.
(10 marks
(b) Consider a token ring with a ring latency of 20 us. Assuming that the "delayed
token release" strategy is used, what is the effective throughput rate that can be
achieved by a 16 Mops ring? Assume that 5 hosts which are evenly placed in the
ring are active. Assume that token transmission time is negligible, but the token
propagation time between two successive hosts is not negligible. Further assume
that frame size is 200 bytes and for each frame transmission the token needs to be
captured and released by a host.
(10 marks)
(c) Describe a scenario wherein a host in a FDDI ring measures TRT as 2xTTRT.
(5 marks)
Please write your answer to Q.2 on the following blank spaces.

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