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The NBAR approach is useful in dealing with malicious [[software]] using known [[TCP and UDP port|ports]] to fake being "priority traffic", as well as non-standard applications using dynamic ports.<ref>''[http://www.cisco.com/warp/public/63/nbar_acl_codered.shtml Using Network-Based Application Recognition and ACLs] for Blocking the "Code Red" Worm'', Cisco.</ref> That's why NBAR is also known as [[OSI_layer_7]] categorization.
On Cisco routers, NBAR is mainly used for [[Quality of Service]]
==References==
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