Constantly annoyed by the imprecision exhibited by the recent, American-style textbooks, which is more or less a consequence of their trying to be heuristic and friendly, but results in many confusions and their being much too time consuming. This is a paradigmatic text that exhibits this sort of imprecision. Along with imprecision comes verbosity.

Also the textbook is quite a sham because it does too many things so it does nothing really good. It should have been condensed to the first five chapters and the last chapter. 800+ pages and after reading the book you won't know what BGP is, but the book introduces off-topic things such as FTP and VoIP.

I came to realize that while computer networking is neither a hard subject nor a deep subject, it is a tedious subject that deals with shits and bloods of the real-world. Maybe a better way to learn is just to stay informed and use the search engine when in doubt.