Which OSI layer provides framing and MAC addressing to enable local network transmission?

• A. Data Link Layer
• B. Transport Layer
• C. Network Layer
• D. Application Layer

Answer: (A)

Framing and MAC addressing are handled by the Data Link Layer. This layer takes data from the Network Layer and wraps it into frames, adding a header with the destination and source MAC addresses and a trailer for error detection. The MAC address is a hardware identifier used to deliver frames to the correct device on the same local network segment, enabling local transmission. It also manages access to the shared medium. Routing and logical addressing (IP) happen at the Network Layer, while end-to-end reliability and porting reside in the Transport Layer. So, the Data Link Layer is responsible for framing and MAC addressing to enable local network transmission.