Ethernet operates at which OSI layer for its basic data handling features such as framing and error detection?

• A. Physical Layer (Layer 1)
• B. Network Layer (Layer 3)
• C. Presentation Layer (Layer 6)
• D. Data Link Layer (Layer 2)

Answer: (D)

Framing and error detection on a local link are handled by the Data Link Layer. Ethernet organizes data into frames that include destination and source MAC addresses, a payload, and a Frame Check Sequence (CRC) to detect errors. This layer is responsible for how bits are packaged into frames for a single link and how those frames are addressed on the local network segment. The Physical Layer is concerned with the actual electrical or optical signals used to transmit those bits, not with how data is packaged or checked for errors. The Network Layer deals with routing and logical addresses (like IP), while the Presentation Layer handles data formatting and encryption/compression. So, Ethernet’s basic data handling features like framing and error detection belong to the Data Link Layer.