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      Question

      Which of the following protocols is most commonly used

      in IoT devices to enable communication between smart devices?
      A HTTP Correct Answer Incorrect Answer
      B FTP Correct Answer Incorrect Answer
      C MQTT Correct Answer Incorrect Answer
      D IMAP Correct Answer Incorrect Answer
      E SMTP Correct Answer Incorrect Answer

      Solution

      MQTT (Message Queuing Telemetry Transport) is a lightweight, publish-subscribe network protocol that is commonly used in IoT (Internet of Things) devices. It is designed for low-bandwidth, high-latency, or unreliable networks, making it ideal for communication between IoT devices. a) HTTP : While HTTP is used for general web communication, it is too heavy for resource-constrained IoT devices. b) FTP : FTP is used for file transfer over a network, not for continuous IoT device communication. d) IMAP : IMAP is used for retrieving emails from a mail server, irrelevant in the context of IoT communication. e) SMTP : SMTP is used for sending emails, not for device communication in IoT networks.

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