depending on your experience networking security technologies and solutions by yusuf bhaji is probably the best
i found it covered around 60% of my exam with experience and guesswork covering the rest though some of the questions i had (approx 6 or so) weren't in the book nor had i any experience of so i just guessed
hope this helps
Hi, Check out this list at Cisco Press for recommended books:
Another list can be found here:
Given that the exam costs $350 and lasts for 2 hours I would want to make sure that I was well prepared before taking it.