Hardening Cisco Routers (O'Reilly Networking)

Cisco IOS Cookbook: Field-Tested Solutions to Cisco Router Problems (Cookbooks (O'Reilly))

Cisco IOS Access Lists: Help for Network Administrators

CEH v9: Certified Ethical Hacker Version 9 Study Guide

CWNA Certified Wireless Network Administrator & CWSP Certified Wireless Security Professional All-in-One Exam Guide (PW0-104 & PW0-204)

Network Warrior: Everything You Need to Know That Wasn't on the CCNA Exam

Cisco IOS in a Nutshell: A Desktop Quick Reference for IOS on IP Networks (In a Nutshell (O'Reilly))

Guide to Computer Forensics and Investigations (with DVD)

Network Troubleshooting Tools (O'Reilly System Administration)

CCENT/CCNA ICND1 100-105 Official Cert Guide

Network Warrior: Everything you need to know that wasn't on the CCNA exam