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Nessus is the granddaddy of all information security tools. While no longer available in its open source form, it still exists as freeware and is actively supported with new signatures.
In this screencast, Peter Giannoulis of Bones Consulting demonstrates how Nessus can be used as a vulnerability assessment tool that enterprises can use to help protect critical systems and networks.
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For more information on the Nessus vulnerability assessment tool, including how to install, configure and build an enterprise scanning program with Nessus, check out SearchSecurity.com's Nessus tutorial.
About the author: Peter Giannoulis, GSEC, GCIH, GCIA, GCFA, GCFW, GREM, CISSP, is an information security consultant in Toronto, Ontario. He currently maintains www.theacademy.ca, which provides organizations streaming video on how to configure and troubleshoot many of today's top security products. He also serves as a technical director for GIAC.