Which device operates at Layer 3 of the OSI model?

Which device operates at Layer 3 of the OSI model?

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

Answer: (B)

Layer 3 of the OSI model is known as the Network layer, which is primarily responsible for determining how data is sent to the destination through various networks. The device that operates at this layer is the router. Routers are essential for directing data packets between different networks, utilizing logical addressing such as IP addresses to forward packets based on the data's destination. Routers analyze the routing table, decide the best path for the data, and forward packets accordingly. This ability to interconnect different networks and manage traffic makes routers crucial in the design and functionality of modern networks. Other devices mentioned operate at different layers: switches typically operate at Layer 2 (Data Link layer) and primarily handle data switching within the same network, hubs are Layer 1 (Physical layer) devices that transmit data without interpreting it, and bridges function at Layer 2, connecting and filtering traffic between separate segments of a local area network. Understanding these distinctions is vital when planning and troubleshooting network configurations.

Layer 3 of the OSI model is known as the Network layer, which is primarily responsible for determining how data is sent to the destination through various networks. The device that operates at this layer is the router. Routers are essential for directing data packets between different networks, utilizing logical addressing such as IP addresses to forward packets based on the data's destination.

Routers analyze the routing table, decide the best path for the data, and forward packets accordingly. This ability to interconnect different networks and manage traffic makes routers crucial in the design and functionality of modern networks.

Other devices mentioned operate at different layers: switches typically operate at Layer 2 (Data Link layer) and primarily handle data switching within the same network, hubs are Layer 1 (Physical layer) devices that transmit data without interpreting it, and bridges function at Layer 2, connecting and filtering traffic between separate segments of a local area network. Understanding these distinctions is vital when planning and troubleshooting network configurations.