Certified Information Systems Security Professional (CISSP) — Question 474

Which Open Systems Interconnection (OSI) layer(s) BEST corresponds to the network access layer in the Transmission Control Protocol/Internet Protocol (TCP/
IP) model?

Answer options

• A. Data Link and Physical Layers
• B. Session and Network Layers
• C. Transport Layer
• D. Application, Presentation, and Session Layers

Correct answer: A

Explanation

The correct answer is A, as the network access layer in the TCP/IP model includes functions from both the Data Link and Physical layers of the OSI model. The other options refer to layers that do not pertain to network access functions, such as the Session, Network, Transport, and Application layers, which serve different purposes in the OSI model.