Explain the design choices that are relevant to minimizing the amount of reply data held at a server.
Compare the storage requirements when the RR and RRA protocols are used.
What will be an ideal response?
To enable reply messages to be re-transmitted without re-executing operations, a server must retain the last
reply to each client. When RR is used, it is assumed that a request message is an acknowledgement of the last
reply message. Therefore a reply message must be held until a subsequent request message arrives from the
same client. The use of storage can be reduced by applying a timeout to the period during which a reply is
stored. The storage requirement for RR = average message size x number of clients that have made requests
since timeout period. When RRA is used, a reply message is held only until an acknowledgement arrives.
When an acknowledgment is lost, the reply message will be held as for the RR protocol.
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What will be an ideal response?
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