Interests into something else is being interested into various aspects in It.

Preparation knowledge in:

Preparation to CCNA / CCNP R&S

The Hacker Playbook: Practical Guide To Penetration Testing

The Basics of Hacking and Penetration Testing, Second Edition: Ethical Hacking and Penetration

CEH: Certified Ethical Hacker Version 8 Study Guide

CEH Certified Ethical Hacker All-in-One Exam Guide, Second Edition

Metasploit: The Penetration Tester's Guide

Hacking Exposed 7: Network Security Secrets &Solutions (Hacking Exposed: Network Security Secrets & Solutions)

Hacking: The Art of Exploitation, 2nd Edition