EC-Council Network Defense Essentials (NDE) Practice Test

In IoT architecture, the Device Layer covers the physical things and the immediate means they use to connect. It includes the sensors, actuators, and other devices, along with the communication methods that let them talk to gateways or edge devices. This means the protocols themselves (like MQTT, CoAP, Zigbee, Bluetooth) and the networks (Wi‑Fi, cellular, LPWAN) that carry data to the next layer. Edge computing can be part of this layer as data is processed near the source before moving on. That’s why describing the device-side communication protocols and networks used for connectivity and edge processing best fits the Device Layer. Statements about user interfaces for remote control relate to how humans interact with the system, which sits in a higher layer. Cloud servers for storage and analytics belong in the cloud/processing layer, not the device layer. Dashboards for monitoring and proactive decisions are part of visualization/decision-support at the application level.