It is newbie stuff. Which makes it all the more surprising that this is one of the poorer articles that David Davis has posted.

#2) figure B is the same as figure A;
#4) "spanning-tree portfast" is not something you want to put on all access ports.
#5) configuring an interface with "speed 100" and "duplex half" is a poor configuration example.

David, 99% of the time I enjoy and learn from your posts; this one reads like it was written by someone other than you.