Using and Administering Linux: Volume 1
David Both
Real-World Bug Hunting
Peter Yaworski
CCNA Certification Practice Tests
Jon Buhagiar
Hands-On AWS Penetration Testing with Kali Linux
Karl Gilbert & Benjamin Caudill
CCNA 200-301 Official Cert Guide Library
Wendell Odom & Jason Gooley & David Hucaby
CCNA 200-301 Official Cert Guide, Volume 2
Wendell Odom