Cisco Certified Network Professional 2025 – 400 Free Practice Questions to Pass the Exam

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How often does UDLD send messages in aggressive mode when no response is received?

Every 1 second for 8 seconds

In UDLD (Unidirectional Link Detection) aggressive mode, the protocol monitors the state of the physical links and actively checks for unidirectional links by sending messages. When a device sends a UDLD message and does not receive a response from the neighboring device, it will continue to send UDLD messages to ensure that the link is still functioning correctly. Specifically, in aggressive mode, UDLD sends messages every 1 second for a duration of 8 seconds when no response is received.

This approach allows for rapid detection of potential issues on the link. After 8 seconds of not receiving responses, the UDLD protocol presumes that the link is unidirectional and can put the port into an err-disabled state to prevent forwarding data, which is crucial for maintaining network reliability and avoiding potential network issues caused by unidirectional links. Thus, the ability to rapidly identify and react to link failures is what makes this option the correct choice.

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