CompTIA Network+ (N10-008) — Question 272

Two users on a LAN establish a video call. Which of the following OSI model layers ensures the initiation, coordination, and termination of the call?

Answer options

• A. Session
• B. Physical
• C. Transport
• D. Data link

Correct answer: A

Explanation

The correct answer is A, as the Session layer is specifically designed to handle the setup, management, and teardown of sessions, like video calls. The Physical layer (B) deals with the transmission of raw bitstreams over physical mediums, while the Transport layer (C) is responsible for reliable data transfer, and the Data link layer (D) focuses on node-to-node data transfer and error detection.