At which layer is deep packet inspection investigated on a firewall?

At which layer is deep packet inspection investigated on a firewall?
A . internet
B. transport
C. application
D. data link

View Answer

Answer: C

Explanation:

Deep packet inspection is a form of packet filtering usually carried out as a function of your firewall. It is applied at the Open Systems Interconnection’s application layer. Deep packet inspection evaluates the contents of a packet that is going through a checkpoint.