Revising the schedule.

I got the impression from last Thursday that some people are having trouble
reading their textbooks (Peterson and Davie, Tanenbaum and Wetherall)
backwards.  If that's so, I can fix that by changing the schedule so that
sections 3 through 6 are reversed in order (that is, the physical layer would
be the next section and the transport layer would be the sixth section; the
seventh and eighth sections remain the same).

With the sections in reverse order, the textbooks can be read in normal
front-to-back order.  Send your opinions, comments, and suggestions to me as
soon as you can so I have enough time to change the schedule if that's what's
wanted.