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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Transport Layer
Exercise:
Problems
Question:20 | ISBN:9780132856201 | Edition: 6

Question

Consider a scenario in which Host A and Host B want to send messages to Host C. Hosts A and C are connected by a channel that can lose and corrupt (but not reorder) messages. Hosts B and C are connected by another channel (independent of the channel connecting A and C) with the same properties. The transport layer at Host C should alternate in delivering messages from A and B to the layer above (that is, it should first deliver the data from a packet from A, then the data from a packet from B, and so on). Design a stop-and- wait-like error-control protocol for reliably transferring packets from A and B to C, with alternating delivery at C as described above. Give FSM descriptions of A and C. (Hint: The FSM for B should be essentially the same as for A.) Also, give a description of the packet format(s) used.

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Answer

The sender sent a message to many times to the user. In this situvation. the channel has lose message if previously received message already.

The following stop-and- wait-like error-control protocol for reliably transferring packets from A and B to C, with alternating delivery at C. The sender received ACK from B and C (or) neither C nor B.


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