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'''Network Based Application Recognition''' (NBAR)<ref>[http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/dtnbarad.htm NBAR defined at Cisco website]</ref> is the mechanism used by some [[Cisco]] [[router]]s and [[Network switch|switches]] to recognize a dataflow by the first [[packet (information technology)|packet]] sent.
The [[Computer network|networking]] equipment which uses NBAR does a [[deep packet inspection]] on the first packet in a dataflow, to determine which traffic category the flow belongs to. It then programs the internal [[ASIC]]s to handle this flow appropriately. The categorization is usually done with [[OSI_layer_4]] info, but new applications have made it difficult to cling to this kind of tagging.
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