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CoAP is a lightweight IoT communication protocol that is designed specifically for constrained devices and networks. It is optimized for low-power and low-bandwidth communication, making it ideal for IoT applications where devices have limited resources and need to operate efficiently in terms of power and bandwidth. CoAP operates over UDP (User Datagram Protocol), unlike HTTP which uses TCP, enabling faster communication with lower overhead. CoAP supports features like request/response communication, multicast support, and resource observation, which makes it suitable for IoT use cases. • Why this is correct: CoAP's design ensures it can operate in low-power, resource-constrained environments, making it the preferred choice for IoT devices that require minimal communication overhead. Why Other Options Are Incorrect: 1. MQTT: MQTT is also a lightweight protocol, but it is primarily used for publish-subscribe communication patterns, not specifically optimized for low-bandwidth as CoAP is. 2. HTTP: HTTP is a widely used protocol for web communication but is not optimized for low-power IoT environments. It typically involves higher overhead due to its reliance on TCP. 3. FTP: FTP is a file transfer protocol and is not suited for IoT applications. It is designed for transferring larger files, which requires more bandwidth and power than typical IoT devices can afford. 4. SOAP: SOAP is a messaging protocol used in web services and is not suited for constrained devices due to its relatively higher overhead compared to protocols like CoAP or MQTT.
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