lucky0977 wrote: » The Eleventh Hour book and to a lesser extent, the CISSP in 21 days were written as a refresher for most people already working in the cyber field. The AIO Shon Harris book is comprehensive and meant for people that need to fill in knowledge gaps. There are eight domains and not everyone has worked in all eight of them so the Shon Harris books are good to gain whatever knowledge you might need for the exam.