Internet of Things (IoT) Practice Exam

Which technology is commonly used for short-range communication between IoT devices?

1. Wi-Fi

2. Bluetooth

3. Celular Data

4. Ethernet

The correct answer is: Bluetooth

Bluetooth is commonly used for short-range communication between IoT devices due to its design specifically for low-power, short-distance connectivity. It operates effectively within a range of approximately 10 to 100 meters, making it ideal for applications where devices need to communicate over short distances without requiring the bandwidth or infrastructure associated with other technologies. Bluetooth is particularly advantageous in IoT deployments where energy efficiency is critical, such as in wearables, smart home devices, and personal gadgets. Its low energy variant, Bluetooth Low Energy (BLE), further enhances its suitability for IoT applications by allowing devices to remain in a low-power state until they need to transmit data, thus prolonging battery life. In contrast, technologies like Wi-Fi are typically used for greater range and higher data throughput but consume more power, making them less effective for small, battery-operated devices in close proximity. Cellular data provides extensive coverage but is generally not designed for short-range communication and can be cost-prohibitive for many IoT applications. Ethernet, while reliable for wired connections, is not suitable for mobile or portable IoT devices due to its physical cabling requirements.