Which of the following belong to the application layer of the Internet of Vehicles ()? (multiple choice)

• A.Remote diagnosis
• B.QoS guarantee
• C.Vehicle anti-theft
• D.UBI

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AR501L1Rc model equipment closed state indicator light is ()?

• A.Ziguang
• B.Red light
• C.Yellow light
• D.No indicator light port

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In device management, DMServer passes commands to the gateway through the () protocol to complete the configuration management of the device?

• A.MQTT
• B.SMTP
• C.CoAP
• D.HTTPS

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The main function of gateway access authentication is to authenticate the identity of the gateway to prevent unauthorized access by unauthorized devices.

• A.True
• B.False

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Among the following options, what is not a key technical feature of NB-loT is ()?

• A.High broadband .
• B.Low cost
• C.Large connection
• D.Wide coverage
• E.Low power consumption

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