GATE CS 2014 Set 1 — Question 36
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Computer Networks → Medium Access & LANs → Token Ring & Polling
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Question
Consider a token ring network with a length of 2 km having 10 stations including a monitoring station. The propagation speed of the signal is m/s and the token transmission time is ignored. If each station is allowed to hold the token for 2 µsec, the minimum time for which the monitoring station should wait (in µsec) before assuming that the token is lost is _______.
Correct answer
28 to 30
Solution
To determine if the token is lost, the monitoring station must wait for the maximum possible time it takes for the token to circulate around the ring once, assuming all stations hold it for the maximum allowed time.Given:
Answer: 30
- Length of network () = 2 km = m
- Propagation speed () = m/s
- Number of stations () = 10
- Token holding time per station () = 2 µsec
2.Calculate Total Token Holding Time:
Since there are 10 stations and each can hold the token for 2 µsec:3.Calculate Total Wait Time:
The monitoring station should wait for the propagation delay plus the sum of holding times of all stations.Answer: 30
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