content: At this point I have only read the TCP/IP and IIS 4.0 sections, but I found them very helpful giving a good general overview of the topics. I then used CBT courseware for more detailed information. A couple of hours before a taking a test I also reveiwed by reading through the specific test section. The section in TCP/IP on subnet masking was the best explanation I have ever read, with instruction for creating and understanding the subnetting chart fantastic, making it easy to create and then answer subnetting questions accurately on the tcp/ip test. The book does not get five stars, because it can only supplement other study material.