IoT MQTT Quiz 01

What is NodeMCU ?

• A programming language

• A microcontroller platform

• A cloud computing service

• A data communication protocol

What does NodeMCU provide that makes it suitable for IoT development ?

• Real-time operating system

• Built-in display screen

• Wireless connectivity and embedded Lua interpreter

• AI-based algorithms

What is the maximum QoS level supported by MQTT ?

• QoS 0

• QoS 1

• QoS 2

• QoS 3

NodeMCU is based on which microcontroller platform ?

• Arduino

• Raspberry Pi

• ESP8266

• STM32

What is MQTT primarily designed for ?

• Email communication

• Real-time data transfer in unreliable networks

• File sharing

• Voice over IP (VoIP)

What is the primary advantage of NodeMCU in comparision to traditional microcontrollers ?

• Lower cost

• Larger size

• Higher power consumption

• Limited connectivity options

Which of the following is a secure version of HTTP that uses encryption ?

• HTTPS

• HTTP/2

• HTTP/3

• HTTP-SSL

What does the term "MCU" stand for in NodeMCU ?

• Microchip Central Unit

• Microcontroller Unit

• Master Control Unit

• Memory Control Unit

What is the standard port for MQTT ?

• 1883

• 8080

• 5672

• 61613

What is the purpose of the MQTT "retain" flag in a PUBLISH message ?

• It ensures message delivery only once

• It indicates the last retained message for a topic

• It specifies the quality of service level

• It controls the subscription hierarchy