Packet-switching: store-and-forward

Problem 1.  Packet-switching: store-and-forward



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  • 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


  1. 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).



  1. 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.  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.






  1. 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.



  1. 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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