单选题What is the purpose of the NBAR protocol discovery？（）Ato build a Packet Description Language Module （PDLM） file to be used in protocol matchingBto discover applications and build class maps for data classificationCto look into the TCP or UDP payload and classify packets based on the contentDto build a database of all application data that passes through the router and queue the data accordingly
单选题
What is the purpose of the NBAR protocol discovery？（）
A
to build a Packet Description Language Module （PDLM） file to be used in protocol matching
B
to discover applications and build class maps for data classification
C
to look into the TCP or UDP payload and classify packets based on the content
D
to build a database of all application data that passes through the router and queue the data accordingly
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