[Solved] Given the Mosquitto configuration snippet:listener 1884 allow_anonymous false password_file /etc/mosquitto/passwdWhat happens if a client tries to connect without a username and password? | Raspberry Pi

Raspberry Pi - MQTT for IoT

Given the Mosquitto configuration snippet:

listener 1884
allow_anonymous false
password_file /etc/mosquitto/passwd

What happens if a client tries to connect without a username and password?

AConnection is refused

BConnection is accepted anonymously

CClient is connected but cannot publish

DBroker crashes

Step-by-Step Solution

Solution:

Step 1: Analyze allow_anonymous setting
Setting 'allow_anonymous false' disables anonymous connections; clients must authenticate.
Step 2: Understand password_file role
The password_file defines valid usernames and passwords for authentication.
Step 3: Predict client connection behavior
Clients without credentials will be refused connection by the broker.
Final Answer:
Connection is refused -> Option A
Quick Check:
Anonymous connections allowed? No = Connection refused [OK]

Quick Trick: Disallow anonymous means clients must authenticate [OK]

Common Mistakes:

MISTAKES

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