Instruct: Classify Amazon reviews into positive or negative sentiment
Query: keeps you on your toes

I feel that the errors were meant to be there. Because if you pick them up. Then you must understand packet structure and IP to binary division, which the book teaches you.Memorising commands is dead headwork compared to actually understanding the TCP/IP structure. Which is also simple,But the book makes you question and find mistakes then double chq I believe its a great learner and periodical reference.