Title: Not worth it
Product review: This book is a waste of money. It doesn't go into detail enough with certain topics, particularly WAN protocols, and has information completely irrelevant to the 507 exam, eg Appletalk. It seems to me that this book was written for the 407 exam and quickly reedited for the 507. The only thing this book might be useful for is to review certain OSI model topics, and that hardly justifies the price. My recommendation is to buy Todd Lammle's guide and a router simulator.
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