Distributed systems UE Past Papers Questions.

Distinguish between buffering and caching.

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A client sends a 200 byte request message to service , which produces a response containing 5000 bytes. Estimate the total time to complete the request in each of the following cases, with the performance assumptions listed below.

• Using connection less ( datagram ) communication ( for eaxample UDP ).
• Using connection - oriented communication ( for example , TCP)
• The server process is in the same machine as the client. [ Latency per packet ( local or remote, incurred on both send and receive ) : 5ms; Connection setup time ( TCP only ): 5 ms, Data stransfer rate: 10 Mbps MTU: 1000 bytes Server request processing time : 2 ms Assume thet the network is lightly loaded. ]

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Which fault - tolerance measures are applied to achieve at least once RMI semantics ?

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Define the asynchronous model of inter - process communication

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