Which port and protocol is commonly used by MQTT over TLS for secure connections?

Which port and protocol is commonly used by MQTT over TLS for secure connections?

• A. 1883 TCP
• B. 8883 TCP
• C. 80 TCP
• D. 443 TCP

Answer: (B)

MQTT over TLS uses TCP as the transport and encryption is added with TLS, and the standard secure port for this setup is 8883. This pairing—MQTT over TLS on TCP port 8883—is what brokers and clients expect when you enable encryption, making it the typical default for secure MQTT connections. The other options point to different, non-secure or non-MQTT services: plain MQTT over TCP uses 1883, while 80 is for HTTP and 443 is for HTTPS. So for a secure MQTT connection, the expected configuration is TCP with port 8883.

MQTT over TLS uses TCP as the transport and encryption is added with TLS, and the standard secure port for this setup is 8883. This pairing—MQTT over TLS on TCP port 8883—is what brokers and clients expect when you enable encryption, making it the typical default for secure MQTT connections. The other options point to different, non-secure or non-MQTT services: plain MQTT over TCP uses 1883, while 80 is for HTTP and 443 is for HTTPS. So for a secure MQTT connection, the expected configuration is TCP with port 8883.