You want to design an IoT system with many Raspberry Pi devices sending sensor data reliably over unstable internet. Why is MQTT the best choice?

hard🚀 Application Q15 of 15

Raspberry Pi - MQTT for IoT

ABecause MQTT messages are always encrypted by default

BBecause MQTT requires all devices to be on the same local network

CBecause MQTT uses a publish-subscribe model that handles unreliable connections well

DBecause MQTT needs high bandwidth to work properly

Step-by-Step Solution

Solution:

Step 1: Understand MQTT communication model
MQTT uses a publish-subscribe system where devices send messages to topics, allowing flexible communication.
Step 2: Consider network reliability
MQTT supports message delivery even with unstable internet by using quality of service levels.
Step 3: Evaluate other options
MQTT does not require devices on the same network, messages are not encrypted by default, and it works well with low bandwidth.
Final Answer:
Because MQTT uses a publish-subscribe model that handles unreliable connections well -> Option C
Quick Check:
Pub-sub + unreliable net = MQTT best [OK]

Quick Trick: MQTT pub-sub fits unstable internet and many devices [OK]

Common Mistakes:

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