Which IoT challenge involves detecting whether devices or sensors are present on the network?

• A. Signaling
• B. Presence detection
• C. Security
• D. Power consumption

Answer: (B)

Presence detection is the process of discovering and confirming which devices or sensors are currently active on the network. This helps keep an up-to-date inventory of assets, ensures you’re collecting data from the right sensors, and allows quick onboarding of new devices or identification of rogue ones that shouldn’t be connected. It’s different from signaling, which is about establishing and managing communication channels, and from security (protecting devices and data) and power consumption (energy use). In practice, presence detection may use network discovery methods, heartbeat messages, or device advertisements to see who is online.