Which devices are commonly associated with the Data Link Layer?

Which devices are commonly associated with the Data Link Layer?

• A. Switches and Bridges
• B. Routers and Firewalls
• C. Hubs and Repeaters
• D. Modems and NICs

Answer: (A)

The Data Link Layer is about delivering frames between directly connected devices and using MAC addresses to decide where those frames should go. Switches and bridges are designed to do exactly that—they inspect the destination MAC address in each frame and forward it only to the appropriate port, effectively creating separate collision domains and facilitating efficient local-network communication. That frame-by-frame, MAC-based operation is the hallmark of Layer 2 devices, which is why switches and bridges are commonly associated with this layer. Hubs and repeaters only pass along electrical signals and do not interpret frames or addresses, so they’re tied to the physical layer. Routers operate at the Network Layer, using IP addresses to route between networks rather than within a single LAN. Modems and NICs play different roles (NICs provide the interface for Layer 2 communication on a host, and modems connect end devices to networks in various ways), but the classic association of Data Link Layer devices is with switches and bridges.

The Data Link Layer is about delivering frames between directly connected devices and using MAC addresses to decide where those frames should go. Switches and bridges are designed to do exactly that—they inspect the destination MAC address in each frame and forward it only to the appropriate port, effectively creating separate collision domains and facilitating efficient local-network communication. That frame-by-frame, MAC-based operation is the hallmark of Layer 2 devices, which is why switches and bridges are commonly associated with this layer.

Hubs and repeaters only pass along electrical signals and do not interpret frames or addresses, so they’re tied to the physical layer. Routers operate at the Network Layer, using IP addresses to route between networks rather than within a single LAN. Modems and NICs play different roles (NICs provide the interface for Layer 2 communication on a host, and modems connect end devices to networks in various ways), but the classic association of Data Link Layer devices is with switches and bridges.