What is the queuing delay of the second packet

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Reference no: EM133389254

There is one packet switch between two hosts A and B, the first link has a rate of 3 Mbps (Mbps = 106 bits/sec) and the second link has a rate of 9 Mbps. Assume there is no other traffic on this network. Host A is sending 20 packets back-to-back (one after the other) having the same size of 52 bytes. Assume output buffers have infinite capacity (= they do not drop packets). Answer the following questions (Each calculated expression and a brief description of each element in the calculation are needed. Solutions limited to final numerical values will not be considered correct)

a) Assume processing and propagation delays are negligible, what is the E2E delay of this transmission (= the time needed to transfer 20 packets from Host A to Host B)?

b) Now consider the same situation as in a) but with a propagation delay of 50 [microseconds] in the first link, and 20 [microseconds] in the second link. What is the E2E delay of this transmission now?

c) Now imagine that the link rates are exchanged, meaning that the first link has a rate of 9 Mbps, and the second link has a rate of 3Mbps. What is the E2E delay of this transmission?

d) In the situation as in c) now imagine that the output buffer of the packet switch is finite with a size of 1 Mbyte. When full, it will drop packets. What is the packet loss rate (= packets_dropped/packets_transmitted)? (Hint: Compute the expected queuing delay of each packet, this packet will be dropped if this delay is higher than the time needed to transmit the whole buffer through the output link.

Question

A packet switch receives a packet and determines the outbound link to which the packet should be forwarded. Suppose there are 2 switches between A and B, these three links have transmission rates of 3 Mbps, 2 Mbps and 1 Mbps, respectively. Suppose there are 2 packets being transmitted back-to-back from A to B, each packet has size 1500 Bytes.

a) What is the queuing delay of the second packet at the first switch?

b) What is the queuing delay for the second packet at the second switch?

Reference no: EM133389254

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