Which statement correctly describes Layer 2 responsibilities and typical devices?

• A. Layer 3 handles node-to-node data transfer with MAC addresses; devices such as switches operate at this layer.
• B. Layer 2 handles node-to-node data with MAC addresses and frames, and devices like switches.
• C. Layer 1 handles data transmission with frames, using hubs.
• D. Layer 4 handles routing between networks using IP addresses.

Answer: (B)

Layer 2, the Data Link layer, handles node-to-node data transfer on a single local link, using MAC addresses to identify devices and frames to carry the data. Switches are typical Layer 2 devices because they inspect MAC addresses inside frames and forward them to the correct destination within the local network.

Think of Layer 3 as managing routing between different networks using IP addresses, with routers doing that work. Layer 1 is the Physical layer, dealing with raw electrical signals, where hubs operate as simple repeaters. Layer 4 is the Transport layer, focusing on end-to-end communication via ports, not routing between networks.

So the statement that Layer 2 handles node-to-node data with MAC addresses and frames, and devices like switches, is correct.