Next-gen firewalls require external visibility tools

Knowing what's happening on your network is a pre-requisite to controlling the traffic. We call that visibility because it combines all of the information the firewall knows, including session and application information, traffic volumes, and rate information, into a way to "see" into your network — to give you visibility.

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Story added 7. May 2012, content source with full text you can find at link above.