Here you can find the latest link to the ‘Penetration Testing with Kali Linux’ security distro Live CD download.
Kali Linux, formerly Backtrack, is the latest Live CD toolset from the security professionals at Offensive Security (OffSec).
Kali Linux Download Page (2015)
Penetration Testing with Kali Linux (PWK) is an online training course designed for network administrators and security professionals who need to acquaint themselves with the world of offensive information security. This penetration testing training introduces the latest hacking tools and techniques in the field and includes remote virtual penetration testing labs for practicing the course materials. Penetration Testing with Kali Linux attempts to simulate a full penetration test, from start to finish, by injecting the student into a rich, diverse, and vulnerable network environment.