IOT IoT Protocols and Standards

Question 1

What does MQTT stand for in IoT communications?

Accepted Answer

Message Queuing Telemetry Transport

Answer

MQTT (Message Queuing Telemetry Transport) is a lightweight publish-subscribe messaging protocol designed for constrained IoT devices.

Question 2

Which IoT protocol uses a RESTful architecture and is designed for constrained devices, often compared to a lightweight HTTP?

Accepted Answer

CoAP

Answer

CoAP (Constrained Application Protocol) is a RESTful protocol designed for use with constrained IoT nodes and networks.

Question 3

In the MQTT protocol, what role does the 'broker' play?

Accepted Answer

It receives messages from publishers and routes them to subscribers

Answer

The MQTT broker acts as a central hub that receives messages from publishers and distributes them to all subscribed clients.

Question 4

What does the IEEE 802.15.4 standard define?

Accepted Answer

Low-rate wireless personal area networks used as the basis for Zigbee and Thread

Answer

IEEE 802.15.4 defines the physical and MAC layers for low-rate wireless personal area networks, forming the foundation for Zigbee, Thread, and 6LoWPAN.

Question 5

Which MQTT Quality of Service (QoS) level guarantees that a message is delivered exactly once?

Accepted Answer

QoS 2

Answer

MQTT QoS level 2 ensures exactly-once delivery using a four-step handshake, the most reliable but highest overhead option.

IOT - Internet of Things Practice Test

IOT - Internet of Things Practice Test

IOT IoT Protocols and Standards