Which device is associated with Layer 2 of the OSI model?

Which device is associated with Layer 2 of the OSI model?

• A. Router
• B. Switch
• C. Hub
• D. Firewall

Answer: (B)

The device that is associated with Layer 2 of the OSI model is a switch. Layer 2, also known as the Data Link Layer, is responsible for defining methods for transferring data between devices on the same local area network (LAN). A switch operates at this layer by using MAC addresses to forward data packets to the appropriate devices on the network. When a switch receives a data frame, it examines the destination MAC address and then forwards that frame only to the port that connects to the intended recipient. This increases the efficiency of the network by reducing unnecessary traffic, as opposed to devices that operate at higher layers, such as routers which deal with Layer 3 (Network Layer) and make decisions based on IP addresses. In contrast, the other devices listed serve different purposes: routers work at Layer 3 and manage traffic between different networks, hubs operate at Layer 1 without any intelligence in directing traffic, and firewalls typically span multiple layers for packet filtering and traffic management. Thus, a switch is the correct answer in the context of Layer 2 functionalities and responsibilities.

The device that is associated with Layer 2 of the OSI model is a switch. Layer 2, also known as the Data Link Layer, is responsible for defining methods for transferring data between devices on the same local area network (LAN). A switch operates at this layer by using MAC addresses to forward data packets to the appropriate devices on the network.

When a switch receives a data frame, it examines the destination MAC address and then forwards that frame only to the port that connects to the intended recipient. This increases the efficiency of the network by reducing unnecessary traffic, as opposed to devices that operate at higher layers, such as routers which deal with Layer 3 (Network Layer) and make decisions based on IP addresses.

In contrast, the other devices listed serve different purposes: routers work at Layer 3 and manage traffic between different networks, hubs operate at Layer 1 without any intelligence in directing traffic, and firewalls typically span multiple layers for packet filtering and traffic management. Thus, a switch is the correct answer in the context of Layer 2 functionalities and responsibilities.