BackTrack is a linux based OS that can be run from a DVD/ USB memory stick or hard disk. It contains hundreds of "hacking" tools that can be used for penetration testing a system. You can do anything from crash cisco systems to cracking WEP and WPA wireless networks. Whatever "penetration testing" you want to do, there is most likely a tool in this distribution that delivers.
BackTrack is a linux based OS that can be run from a DVD/ 
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