I was asked to suggest some of the Review Problems at the end of Chapter 5 for the purpose
of guiding study. I've rated the problems +, *, and - with the meanings:
<ul>
  <li>+: something that you should know, or be able to present an rational discussion about</li>
  <li>*: something that maybe you would find helpful but it doesn't help me understand the problem (the analogies to various non-networking scenarios are largely in this category)</li>
  <li>-: things that I don't expect you to study or know.
</ul>

The + questions are: R2, R3, R5, R8, R9, R10, R11, R12, R14
<p>
  The * questions are: R1, R4, R7
  <p>
The - questions are: R6, R13, R15, R16