350-801 Question #298: Real Exam Question with Answer & Explanation

The correct answer is C: DNS. For an IP phone to register with a Cisco Unified Communications Manager (CUCM) using a hostname, the Domain Name System (DNS) is the network service responsible for resolving that hostname to an IP address.

Protocols and Endpoints

Question

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

Options

ASMTP
BICMP
CDNS
DSNMP

Explanation

For an IP phone to register with a Cisco Unified Communications Manager (CUCM) using a hostname, the Domain Name System (DNS) is the network service responsible for resolving that hostname to an IP address.

Common mistakes.

A. SMTP (Simple Mail Transfer Protocol) is used for sending and receiving email.
B. ICMP (Internet Control Message Protocol) is primarily used for diagnostic and error reporting purposes, such as network reachability.
D. SNMP (Simple Network Management Protocol) is used for managing and monitoring network devices.

Concept tested. DNS role in IP phone registration

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1SU1/systemConfig/cucm_b_system-configuration-guide-1251su1/cucm_b_system-configuration-guide-1251su1_chapter_010.html

Topics

#DNS#Hostname Resolution#Phone Registration#CUCM

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