The data link layer is unique because it can be divided into sublayers. What sublayer is primarily responsible for hardware addressing?

The data link layer is unique because it can be divided into sublayers. What sublayer is primarily responsible for hardware addressing?

• A. LLC (Logical Link Control) sublayer
• B. Physical sublayer
• C. MAC sublayer
• D. Network sublayer

Answer: (C)

Hardware addressing in the data link layer is handled by the MAC sublayer. The MAC (Media Access Control) sublayer is responsible for framing and controlling access to the local network medium, and it places the hardware addresses into the frame header. Each frame includes a destination MAC address and a source MAC address, which lets devices on the same LAN identify where the frame is coming from and where it should go next. This addressing is specific to the local link and does not involve routing between networks. In contrast, the LLC (Logical Link Control) sublayer handles multiplexing upper-layer protocols and basic error detection or flow control, but not the actual hardware addresses. The Physical sublayer governs the electrical or optical signaling on the medium itself, not addressing. The Network layer operates above the data link layer and uses IP addresses for routing across networks, not hardware addresses on the link.

Hardware addressing in the data link layer is handled by the MAC sublayer. The MAC (Media Access Control) sublayer is responsible for framing and controlling access to the local network medium, and it places the hardware addresses into the frame header. Each frame includes a destination MAC address and a source MAC address, which lets devices on the same LAN identify where the frame is coming from and where it should go next. This addressing is specific to the local link and does not involve routing between networks.

In contrast, the LLC (Logical Link Control) sublayer handles multiplexing upper-layer protocols and basic error detection or flow control, but not the actual hardware addresses. The Physical sublayer governs the electrical or optical signaling on the medium itself, not addressing. The Network layer operates above the data link layer and uses IP addresses for routing across networks, not hardware addresses on the link.