We have received countless request regarding what book(s) should candidates use when learning and preparing for exams.
When learning new technologies it is always good to have a well written book to explain the technologies. Free CCNA Workbook primarly provides workbook labs however there is core knowledge you must know which you may not find on this website. For this we refer you to the official Cisco CCNA Certification Study Guide published by Cisco Press.
There are of course tons of books on the market that CCNA candidates can use to prepare for CCNA Certification exam(s). We have put together a nice little list of books by popular authors known throughout the networking industry for their skills and educational abilities.