Linux Bible (10th edition)
Christopher Negus
Designing and Implementing Linux Firewalls with QoS Using Netfilter, ...
Lucian Gheorghe
Ethical Hacker’s Penetration Testing Guide
Samir Kumar Rakshit
GitHub For Dummies
Sarah Guthals & Phil Haack
The Complete Metasploit Guide
Sagar Rahalkar
The the Complete Metasploit Guide
Sagar Rahalkar & Nipun Jaswal