Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 423

If a phone needs to register with cucm1.cisco.com, which network service assists with the phone registration process?

Answer options

• A. SMTP
• B. ICMP
• C. DNS
• D. SNMP

Correct answer: C

Explanation

The correct answer is C, DNS, as it resolves domain names to IP addresses, allowing the phone to locate and communicate with the Cisco Unified Communications Manager (CUCM). SMTP, ICMP, and SNMP serve different purposes: SMTP is for email transmission, ICMP is used for network diagnostics, and SNMP is for network management.