Knowledge checks


Routing versus forwarding. 



Choose one the following two definitions that makes the correct distinction between routing versus forwarding.




 

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1/7

Packet switching versus circuit switching (1). 



Which of the characteristics below are associated with the technique of packet switching? Select all correct answers. [Hint: more than one of the answers is correct].




 

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2/7

Packet switching versus circuit switching (2).



  Which of the characteristics below are associated with the technique of circuit switching? Select all correct answers. [Hint: more than one of the answers is correct].




 

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3/7

How many calls can be carried?



Consider the circuit-switched network shown in the figure below, with  four circuit switches A, B, C, and D. Suppose there are 20 circuits between A and B, 19 circuits between B and C, 15 circuits between C and D, and 16 circuits between D and A.

Question 1.3.4


What is the maximum number of connections that can be ongoing in the network at any one time?

[Note: you can find more questions like this one here.




 

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4/7

Trying out traceroute. 



Perform a traceroute from your computer (on whatever network you happen to be on) to gaia.cs.umass.edu. Use traceroute (on Mac terminal) or tracert (on Windows command line) or tracepath (on a Linux command line). Enter the missing part of the name of the router just before the host gaia.cs.umass.edu is reached:

??.cs.umass.edu

Note: Routing may change, so the answer here may not be correct anymore.  Also, if you are a Verizon user, there are known problems using traceroute with Verizon - if traceroute shows you two hops only to gaia.cs.umass.edu or any destination, skip this question.





 

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Not quite. Your answer isn't correct. Note that network configurations may change and so the earlier answer to this question in early 2020 may no longer be the right asnwer,.  So your answer could be correct.

5/7

What is a network of networks?



  When we say that the Internet is a “network of networks,” we mean? Check all that apply (hint: check two or more).




 

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6/7

Packet switching or Circuit-switching?



Consider a scenario in which 5 users are being multiplexed over a channel of 10 Mbps.  Under the various scenarios below, match the scenario to whether circuit switching or packet switching is better.



Question List:
Answer List:
  1. Neither works well in this overload scenario

  2. Circuit switching

  3. Packet switching


 

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7/7

We gratefully acknowledge the programming and problem design work of John Broderick (UMass '21), which has really helped to substantially improve this site.

Copyright © 2010-2021 J.F. Kurose, K.W. Ross
Comments welcome and appreciated: kurose@cs.umass.edu