At which layer of the OSI/RM do packet filters function?
A.
Data link layer
B.
Physical layer
C.
Network layer
D.
Transport layer
Explanation:
A packet filter operates at the IP (Network – Layer 3) level. Most packet filters are implemented in routers, and a router is a layer 3 device. Also, the terminology of data at the network layer is “packet”.
Incorrect Answers:
A, B, D: Packet Filters runs at the network layer, making the other answers incorrect.