CompTIA Network+ (N10-007) — Question 259

At which of the following OSI model layers would a router operate?

Answer options

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

Correct answer: B

Explanation

A router operates at the Network layer (Layer 3) of the OSI model, where it is responsible for forwarding data packets between different networks. The Physical layer (Layer 1) deals with the hardware transmission of data, the Transport layer (Layer 4) manages end-to-end communication and reliability, and the Data link layer (Layer 2) is responsible for node-to-node data transfer.