__________ layer is the communication layer that connects the IoT devices with WAN.

• A. Internet layer
• B. Network layer
• C. Application layer
• D. Sensor layer

Answer: (B)

Routing between networks is handled by the Network layer. This layer provides logical addressing and path selection so packets can travel from an IoT device on a local network out to a wide-area network, moving through routers and gateways along the way. It sits between the local data link layer (which covers the immediate network segment) and the higher layers (like transport and applications) that handle end-to-end delivery and app services. The Internet layer is a related concept in the TCP/IP model, but in this context the term Network layer best captures the inter-network routing role required to connect to a WAN. The Application layer focuses on app-level services, and the Sensor layer isn’t a formal network layer.