Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 303

An administrator troubleshoots a DNS issue with Cisco UCM and observes that the hostname resolution returns the wrong IP address. The DNS team informs the administrator that the A/AAA record was recently updated on the DNS server. Which action must be taken on Cisco UCM to reflect the correct entries?

Answer options

• A. Restart the DNS server to flush any stale entries
• B. Flush the current cache using this CLI command: admin:utils network name-service hosts cache invalidate
• C. Delete the arp entry of the host utils network arp delete
• D. Flush the current cache using this CLI command: admin:utils network name-service hosts cache validate

Correct answer: B

Explanation

The correct answer is B because using the CLI command 'admin:utils network name-service hosts cache invalidate' will clear the cached DNS entries, allowing Cisco UCM to retrieve the updated IP from the DNS server. Option A is incorrect because restarting the DNS server does not impact the Cisco UCM directly. Option C is not relevant to DNS resolution, and Option D is also incorrect as it validates the cache rather than flushing it.