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Security of systems typically requires authentication systems (eg. login name and password), access control lists (controlling who has access to what resource), auditing (a trail of who accessed what and when in a log file), certificates (keys used to connect client systems to servers), firewalls (to restrict access into trusted networks), virsus scanners, email filters, virtual private networks, secure tunnels, trausted systems, and the list goes on.
Microsoft Windows Security Web Sites
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Network Security
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