Which of the following operates at the Network Layer of the Open System Interconnection (OSI) model?

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Which of the following operates at the Network Layer of the Open System Interconnection (OSI) model?
A . Packet filtering
B . Port services filtering
C . Content filtering
D . Application access control

Answer: A

Explanation:

Reference: https://www.sans.org/reading-room/whitepapers/protocols/applying-osi-layer-network-modelinformation-security-1309 (10)