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Unformatted text preview: Protocol is for clock synchronization Readings : Dollimore: ch 11.1 to 11.3 and Tanenbaum: ch 5.1 Question 1 What are the two main purposes for clock synchronization? What are the design requirements of a system to synchronize the clocks in a distributed system? Question 2 Compare the tradeoffs between external and internal synchronization. Question 3 Assume min one-way time =12 time units. What is the time for P (denote as T(P)) after clock adjustment? What is the accuracy? m P (t=26) m S (t=36) t P =60 when m S is received Time server S Client P Use the Cristian Algorithm to calculate the time to be set at client P and to estimate the accuracy. Question 4 Use the NTP protocol to synchronize two servers A and B. The timestamps are shown in the following diagram. (a) What is the estimated time offset? (b) What is the accuracy according to (a)? Server B Server A 80 m(60) 12 m’ Time t t’ 9...
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- Spring '10
- Network Time Protocol, Cristian Algorithm