Certified Information Systems Security Professional (CISSP) — Question 28

When conducting a remote access session using Internet Protocol Security (IPSec), which Open Systems Interconnection (OSI) model layer does this connection use?

Answer options

• A. Presentation
• B. Transport
• C. Network
• D. Data link

Correct answer: C

Explanation

The correct answer is C, Network, because IPSec operates at the network layer of the OSI model, providing security for IP packets. The other layers, such as Presentation and Transport, do not directly handle the encapsulation and security of the network packets like IPSec does.