Study Guide to Network+

I recently bought Mike Meyer's Network+ Study Guide, and I had a good experience with it, covers all the good points and its condensed enough to provide a great review if you happen to have already taken some courses on the subject.

The "Contents" page is also sorted by the objectives covered in the exam, it comes with a CD with practice questions and a pdf of the whole book so you can find what you need right away.

It cost me a little more than $20 used and I found it to be very useful for what I paid for. I can't say that you'll pass the exam with this one book, but it served its purpose as a condensed version of what the exam will contain.