When trying to subscribe to an MQTT broker on the internet, the MQTT client is on a private subnet and must be NATed to reach the public broker. What is the expected outcome when this configuration is in place?

The client connects only once using the CONNECT massage to the broker.

The client periodically reconnects to the default gateway.

The client connects only once using the PENDING message to the broker.

The client periodically reconnects to the broker over the NAT connection.

Which computer security concept is violated when a web server is written that uses the ''root'' account for all interactions with a Linux system?

certificate-based authentication

Refer to the exhibit. Which two statements about MQTT messaging are true? (Choose two.)

Result code 0 means the connection is accepted; result code 5 means the connection is 'refused, not authorized'.

Brokers can send the Last Will and Testament messages on behalf of the client.

Result code 5 means the connection is accepted; result code 0 means the connection is 'refused, not authorized'.

Redundant ClientIDs are supported by MQTT brokers.

MQTT does not support a 'keep alive' functionality because it runs on top of TCP.

Free Cisco 300-915 Exam Practice Questions & Explanations

Last updated on: Oct 29, 2026
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