350-801 Question #247: Real Exam Question with Answer & Explanation

Question

Which entity does Cisco UCM use DNS to resolve fully qualified domain names to an IP address?

Options

• ACisco UCM Name
• Bprimary TFTP server for option 150
• CSIP trunk
• Dapplication server name

Explanation

Cisco UCM utilizes DNS to resolve the Fully Qualified Domain Name (FQDN) configured for a SIP trunk into an IP address, enabling it to establish communication with the remote SIP entity for call routing.

Common mistakes.

• A. The 'Cisco UCM Name' refers to the local server's host name and is not an entity that UCM needs to resolve via DNS for external communication paths.
• B. While TFTP servers are crucial, the 'primary TFTP server for option 150' is typically provided as an IP address or discovered by endpoints, not usually as an FQDN that UCM itself resolves for its own TFTP service operation.
• D. While an 'application server name' can be an FQDN, SIP trunks are a core communication path in UCM that heavily relies on DNS resolution for establishing calls to external entities, making it the most direct and common example.

Concept tested. Cisco UCM DNS resolution for SIP trunks

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/cucm_b_admin-guide-1251/cucm_b_admin-guide-1251_chapter_0100.html

No community discussion yet for this question.