Question

Outline the design of a scheme that uses message retransmissions with IP multicast to overcome the problem of dropped messages. Your scheme should take the following points into account:

i) There may be multiple senders.
ii) Generally only a small proportion of messages are dropped.
iii) Recipients may not necessarily send a message within any particular time limit.

Answer 1

To overcome dropped messages in a scheme that uses IP multicast, consider multiple senders, a small proportion of dropped messages, and recipients who may not send a message within a time limit.

Step-by-step explanation:

To design a scheme that uses message retransmissions with IP multicast to overcome dropped messages, consider the following points:

1. Multiple senders can be accommodated by having each sender assign a unique identifier to their messages.
2. Since only a small proportion of messages are dropped, retransmissions can be limited to only those messages that do not receive acknowledgments.
3. Recipients who do not send a message within a time limit can be considered as having received the message successfully.

This scheme ensures that messages are reliably delivered even in the presence of dropped messages.