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Which of the following is a network security device that operates at the session layer of the OSI model?
Correct Answer: B
Option 1: Incorrect. A firewall operates at the network layer (layer of the OSI model, not the session layer (layer 5). Option 2: Correct. An Intrusion Prevention System (IPS) operates at the session layer (layer 5) of the OSI model. It monitors network traffic in real-time and can block or prevent malicious activities. Option 3: Incorrect. An Intrusion Detection System (IDS) operates at the network layer (layer of the OSI model, not the session layer (layer 5). Option 4: Incorrect. SSL/TLS is a cryptographic protocol that operates at the transport layer (layer of the OSI model, not the session layer (layer 5).