Certified Network Defender (CND) — Question 18

Heather has been tasked with setting up and implementing VPN tunnels to remote offices. She will most likely be implementing IPsec VPN tunnels to connect the offices. At what layer of the OSI model does an IPsec tunnel function on?

Answer options

• A. They function on the data link layer.
• B. They work on the network layer.
• C. They function on either the application or the physical layer.
• D. They work on the session layer.

Correct answer: B

Explanation

The correct answer is B because IPsec operates at the network layer of the OSI model, providing secure communication for data packets. Options A, C, and D are incorrect as they refer to layers where IPsec does not function; the data link layer, application layer, physical layer, and session layer do not handle the encryption and tunneling that IPsec provides.