Bird
0
0

What does QoS level 1 guarantee in MQTT communication?

easy🧠 Conceptual Q11 of 15
Raspberry Pi - MQTT for IoT
What does QoS level 1 guarantee in MQTT communication?
AAt least once delivery of the message
BExactly once delivery of the message
CAt most once delivery of the message
DNo delivery guarantee
Step-by-Step Solution
Solution:

  1. Step 1: Understand QoS levels in MQTT

    QoS 0 means no guarantee, QoS 1 means at least once, QoS 2 means exactly once.

  2. Step 2: Identify QoS 1 guarantee

    QoS 1 ensures the message is delivered at least once, but duplicates may occur.

  3. Final Answer:

    At least once delivery of the message -> Option A

  4. Quick Check:

    QoS 1 = At least once delivery [OK]
Quick Trick: QoS 1 means message arrives at least once [OK]
Common Mistakes:
MISTAKES
  • Confusing QoS 1 with exactly once delivery
  • Thinking QoS 1 has no delivery guarantee
  • Mixing QoS 0 and QoS 1 guarantees

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Raspberry Pi Quizzes
Automation and Scheduling - Email alerts on sensor thresholds - Quiz 12easy Data Logging and Databases - InfluxDB for time-series data - Quiz 9hard MQTT for IoT - Multi-device MQTT network - Quiz 3easy MQTT for IoT - paho-mqtt library usage - Quiz 3easy MQTT for IoT - Multi-device MQTT network - Quiz 2easy MQTT for IoT - MQTT broker setup (Mosquitto) - Quiz 12easy MQTT for IoT - paho-mqtt library usage - Quiz 8hard Web Server and API - WebSocket for live updates - Quiz 5medium Web Server and API - Why web servers enable remote IoT control - Quiz 2easy Web Server and API - Controlling GPIO through web interface - Quiz 12easy