350-801 CLCOR: Implementing and Operating Cisco Collaboration Core TechnologiesDemo

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QuestionQ20

Infrastructure and Design

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Refer to the exhibit. An engineer has configured NTP on Cisco UCM and runs the utils ntp status command from the Cisco UCM CLI, receiving an error message. How should this issue be mitigated and resolved?

  • A Use an external NTP server and allow communication on port 53.
  • B Ensure that Cisco UCM can communicate with the NTP server on port 53 and have a Windows NTP server configured with NTPv3.
  • C Configure the NTP server to answer requests on port 443.
  • D Ensure that Cisco UCM can communicate with the NTP server on port 123 and have a Linux NTP server configured with NTPv4.
Explanation

Cisco UCM uses NTP over UDP port 123. For CUCM 9.x and later, an NTPv4 source is required; an NTPv3 response can leave the system unsynchronized even though NTPv4 is generally backward-compatible. Cisco recommends a Linux-based external NTP server (or Cisco IOS/IOS XE) configured for NTPv4.

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