Question: Consider two nodes A and B connected by two store-and-forward switches S1 and S2. The links connecting a node to a switch and a switch

Consider two nodes A and B connected by two store-and-forward switches S1 and S2. The links connecting a node to a switch and a switch to another switch have the same bandwidth of 10 Mbps and a propagation delay of 1 ms. Assume each switch begins retransmitting immediately after it has finished receiving the packet.

(a) What is the one-way latency (first bit sent to last bit received) for sending a 3-KB packet from A to B?

(b) Now, assuming that packets are 3-KB long, but each packet includes a header that is 300-byte long. Suppose that after A sends a 3-KB packet to B, it waits for a 100-byte acknowledgment to be sent from B to A before sending the next packet. What is the long-term effective bandwidth for sending data from A to B? Note that the long-term effective bandwidth is defined as Data Transfer Size/Total Transfer Time. In addition, header is not included when counting data size.

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