What is Deep Packet Inspection?

What is Deep Packet Inspection?
A . a machine learning method of packet inspection for the purpose of choosing which dynamic routing protocol to automatically assign
B . a concept that applies to firewalls, when examining packets only up through Layer 4
C . a function of Policy Based Routing that examines the entire IPv4 header to forward traffic based on factors other than destination address
D . a firewall process of examining the packet header all the way to Layer 7 in order to determine if the packet should be permitted or denied

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Answer: D