350-801 Question #483: Real Exam Question with Answer & Explanation

Question

An engineer is trying to add a new subscriber to the cluster of Cisco UCM, and the synchronization is failing. The engineer obtained the output from the publisher and noticed the error. Based on the output, what is the issue?

Options

• AThe NTP server is running out of space in the hard drive, which prevents the cluster service from
• BThe NTP service is pointing to the wrong publisher.
• CThe NTP server must be replaced by another server with NTP stratum 1, 2, or 3 running version
• DThe NTP server for Cisco UCM must be stratum 6 or higher.

Explanation

When adding a subscriber to a Cisco UCM cluster, synchronization can fail due to an invalid NTP source. Cisco UCM requires an NTP server with a stratum level of 1, 2, or 3 to ensure accurate and reliable time synchronization across the cluster for proper operation.

Common mistakes.

• A. An NTP server running out of hard drive space is not a typical reason for NTP synchronization failure in a UCM cluster and is unrelated to the stratum level, which is a common cause of such issues.
• B. While an NTP service pointing to the wrong publisher could cause time synchronization problems, the question implies an error related to the NTP server itself (likely stratum or version issues) rather than just misconfiguration.
• D. Cisco UCM explicitly requires NTP servers to be stratum 1, 2, or 3, not stratum 6 or higher; stratum 6 or higher would indicate a less accurate time source and is not supported for cluster synchronization.

Concept tested. Cisco UCM NTP Stratum Requirements

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/12_0_1/cucm_b_install-guide-cucm-1201/cucm_b_install-guide-cucm-1201_chapter_0110.html#task_AB0D95A720D9BA112C7859871329EF50

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