Packet-switching: store-and-forward

Problem 1. (10 pt.) Packet-switching: store-and-forward


  • Assume no other delay source than transmission delay
  • Packet length (L) = 4 MB
  • Link bandwidth (R) = 100 Mbps
  • Note that ‘B’ stands for bytes and ‘b’ stands for bits in the metrics above
  • Calculate the end-to-end delay, assuming that source and destination directly connected thru a single link without any intermediate network device in between (i.e., Source —- Destination).
  • Calculate the end-to-end delay, assuming that source and destination connected thru three intermediate links with two intermediate network devices in between (i.e., Source —- Network Device1 —- Network Device2 —- Destination).

Problem 2. (10 pt.) Circuit-switching

Consider the following circuit-switched network. Assume that there are 5 circuits on each link. Note that the circuit switching in the slide of “Alternative core; circuit switching” assumes four circuits on each link.

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  • Suppose that all connections are between the switch in the upper-left-hand corner and the switch in the lower-right-hand corner. What is the maximum number of simultaneous connections that can be in progress. Justify your answer.
  • What is the maximum number of simultaneous connections (from any to any) that can be in progress at any one time in this network. Justify your answer.

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