Internet of Things (IoT) Practice Exam

Which protocol is widely used for connecting devices in IoT applications?

1. HTTP

2. FTP

3. MQTT

4. SMTP

The correct answer is: MQTT

The correct choice is MQTT, which stands for Message Queuing Telemetry Transport. This protocol is specifically designed for low-bandwidth, high-latency, or unreliable networks, making it ideal for various IoT applications where devices may not have a constant connection. MQTT is lightweight, meaning it requires minimal overhead, which is crucial for resource-constrained devices like sensors and small IoT devices. One of the central features of MQTT is its publish/subscribe messaging model which facilitates efficient communication between devices. This model allows devices to send information to a broker that manages the messages, allowing multiple devices to subscribe to specific topics. This makes it highly scalable and flexible for diverse IoT ecosystems where many devices need to communicate efficiently. In contrast, protocols like HTTP, FTP, and SMTP are not as well-suited for IoT applications. HTTP, while commonly used for web communication, involves more overhead and is not optimized for the low-bandwidth environments typical of many IoT scenarios. FTP is primarily used for transferring files, which does not align with the requirements of real-time data transmission prevalent in IoT communication. SMTP, being an email protocol, is also not applicable to the immediate data exchange required by IoT devices. Therefore, MQTT stands out as the most