I passed my TCP/IP 3.51 exam recently. The following is what I recalled:

* Subnet mask is very easy. Many books advised you to memorize the table to save time. I think it is not neccessary.

* Some questions are about UNIX printing. It involves HP's DLC protocol. If you install the protocol and driver in your server, there are very few configurations on the client side. Elminiate the options about doing a lot of configuration in UNIX.

* The questions on DHCP are lengthy and the graphs would confuse you. Remember: DHCP only overrides IP and subnet mask. It does nothing to your locally configured default gateway and WINS. Don't panic if you see a very complicated graph and screen shot.

* Overall questions are tricky and graphs tend to confuse you. Ignore unrelated information on the graph. For example, one question is about the number of required networks. The graph shows ethernet and token ring. The topology doesn't matter!