CompTIA Network+ (N10-007) — Question 359

At which of the following layers of the OSI model does compression occur?

Answer options

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

Correct answer: D

Explanation

Compression takes place at the Presentation layer of the OSI model, as this layer is tasked with data format translation and transformation. The Session layer manages sessions between applications, the Transport layer is responsible for end-to-end communication, and the Data link layer handles node-to-node data transfer, none of which involve compression.