Certified Cloud Security Professional (CCSP) — Question 299

Which OSI layer does IPsec operate at?

Answer options

• A. Network
• B. transport
• C. Application
• D. Presentation

Correct answer: A

Explanation

IPsec operates at the Network layer of the OSI model, where it is responsible for securing IP communications through encryption and authentication. The Transport layer deals with data transfer and reliability, the Application layer deals with end-user services, and the Presentation layer is responsible for data formatting and translation, making them incorrect choices for where IPsec functions.