Layer 3 of the OSI model controls routing between network devices.

• A. True
• B. False
• C. Not sure
• D. It depends

Answer: (A)

Layer 3, the Network layer, is responsible for routing packets between different networks. It uses logical addresses (like IP addresses) and routing decisions to forward data from one network segment to another, often through routers. This is how data travels from the source device on one network to a destination device on another network, across multiple hops. Within a single local network, forwarding is typically handled by Layer 2 devices (switches) using MAC addresses, so the routing between networks is specifically a Network layer function. Routers are the devices that perform this Layer 3 routing.