First draft questions for section 4, part 1.

Here are some questions in first draft taken from the first 10 pages of the
readings for section 4 (pages 315 to 324 in the K&R fifth edition: Chapter 4,
the network layer; sec. 4.1, introduction; sec. 4.1.1, forward and routing;
sec. 4.1.2, network service model; sec. 4.2, virtual circuits and datagram
networks; 4.2.1 virtual circuit networks for those with other editions).

First draft questions are sloppy and rough, but some of them go on to become
test questions.  Because they're in first draft, the questions may not make
sense, or they may not have answers, or the answers may require ridiculous
amounts of work to find (for example, the evaluating and analyzing questions
are almost the same).  However, they are drawn from the readings and may be
helpful in that way, if not useful in any other way.

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Define:

  forwarding	       connection set-up
  routing              network service model
  routing algorithms   constant bit rate (CBR) ATM service
  forwarding table     available bit rate (ABR) ATM service
  link-layer switches  virtual circuit(vc) network
  routers              datagram network
  virtual circuit

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Explain the difference between forwarding and routing.

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Which is more suitable for a bandwidth-elastic application: CBR or ABR?

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Of the potential network services available to a transport layer, which are
most valuable? 

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Given a transport connection may traverse either datagram or virtual-circuit
networks (the transit networks), which network services offered by each type of
transit network is most beneficial for the transport connection?

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If humans determine forwarding-tables content, it might be useful to create
some guidelines that determine if the forward-table content is useful.  Suggest
some guidelines with examples.