CompTIA Network+ (N10-009) — Question 311

Which of the following layers in the OSI model is responsible for establishing, maintaining, and terminating connections between nodes?

Answer options

• A. Physical
• B. Network
• C. Session
• D. Transport

Correct answer: C

Explanation

The correct answer is C, Session, as this layer specifically handles the establishment, maintenance, and termination of sessions between applications. The Physical layer (A) deals with the transmission of raw bitstreams, the Network layer (B) is responsible for routing packets, and the Transport layer (D) manages end-to-end communication and data flow, but does not handle sessions directly.