CV0-003 Question #206: Real Exam Question with Answer & Explanation

The correct answer is A: A firewall is blocking the port on the license server.. A firewall blocking the license server port for the new delivery controller is the most likely cause of a license error when a second controller joins an existing cluster, because firewall rules often do not automatically extend to newly added cluster members.

Troubleshooting

Question

A cloud architect created a new delivery controller for a large VM farm to scale up according to organizational needs. The old and new delivery controllers now form a cluster. However, the new delivery controller returns an error when entering the license code. Which of the following is the MOST likely cause?

Options

AA firewall is blocking the port on the license server.
BThe existing license is for a lower version.
CThe existing license is not supported for clusters.
DThe existing license has expired.

Explanation

A firewall blocking the license server port for the new delivery controller is the most likely cause of a license error when a second controller joins an existing cluster, because firewall rules often do not automatically extend to newly added cluster members.

Common mistakes.

B. A lower-version license would have already caused failures on the existing delivery controller and would have been detected before attempting to expand the cluster.
C. If the license did not support clustered deployments, the cluster formation process itself would have failed or generated errors rather than allowing the cluster to form but blocking only license activation.
D. An expired license would prevent all controllers in the cluster from validating against the license server, not selectively block only the newly added node.

Concept tested. Delivery controller cluster licensing and firewall port access

Reference. https://docs.citrix.com/en-us/licensing/current-release/license-server/licensing-technical-overview.html

Topics

#licensing#firewall ports#cluster configuration#delivery controller

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