Below are some books I have related to cyber security: PENETRATION TESTING AND NETWORK DEFENSE Authored by Daniel P.Newman & Andrew WhitakerPublished by Cisco Press CEH: CERTIFIED ETHICAL HACKER VERSION 8 STUDY GUIDE Authored by Sean-Philip OriyanoPublished by Sybex/Wiley*note the link is to the current version of this study guide. CCNA SECURITY 210-260 Authored by Omar Santos CISSP No.463598 and John Stuper CCIE No.11154Published by Cisco Press