download linux

kali linux - http://www.kali.org/

ubuntu - http://www.ubuntu.com/download

blackbuntu - http://www.pen-tests.com/blackbuntu-download.html

backtrack 5R1- http://www.pen-tests.com/backtrack-5-r1-download.html

 NIST Guideline in Network Security Testing - http://www.pen-tests.com/nist-guideline-in-network-security-testing.html

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