350-801 Question #205: Real Exam Question with Answer & Explanation

Question

Configuration of DNS is required to achieve a fully functional Cisco UCM system Cisco UCM uses DNS to resolve fully qualified domain names to IP addresses for which destinations?

Options

• AApplication server name
• BPrimary TFTP Server for option 150
• CCisco Unified Communications Manager Name
• DSip trunk

Explanation

Cisco UCM uses DNS to resolve Fully Qualified Domain Names (FQDNs) to IP addresses primarily for SIP trunks, enabling communication with other SIP entities that are often identified by FQDNs.

Common mistakes.

• A. While application servers might use FQDNs, CUCM typically connects to them via IP address for internal services, and their FQDN resolution is not the primary use case for UCM's internal DNS resolution.
• B. The primary TFTP server address is typically provisioned directly via DHCP Option 150 (IP address) or configured manually, and its FQDN is not primarily resolved by CUCM itself for its own operation.
• C. The Cisco Unified Communications Manager Name is an internal identifier and does not typically require DNS resolution by the CUCM system itself to operate; CUCM nodes within a cluster communicate using IP addresses.

Concept tested. CUCM DNS usage for SIP trunks

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/cucm_admin_guide/cucm_admin_guide_chapter0100.html

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