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Difficulty: EasyDNS Infrastructure and Record Types

A network administrator is deploying a Voice over IP (VoIP) system across an enterprise network. The administrator needs to configure a DNS record that allows client IP phones to dynamically discover the hostname and specific port number of the Session Initiation Protocol (SIP) server. Which DNS resource record type should the administrator create to fulfill this requirement?

  1. An SRV recordAnswer
  2. B
    A PTR record
  3. C
    A CNAME record
  4. D
    An MX record

Answer

An SRV record is the correct DNS record type for specifying service hostnames and port numbers.
SRV (Service Location) records enable clients to discover hostnames and designated port numbers for specific services and protocols (such as SIP or LDAP).

Step-by-Step Solution

1
Identify the technical requirements of the scenario.
The requirement is to map a network service (SIP for VoIP) to its hostname, priority, weight, and port number in DNS.
Client applications need both server identification and destination port information for service auto-discovery.
2
Evaluate standard DNS record capabilities.
SRV records are designed specifically to provide service location data including port numbers and protocols.
Standard host records (like A or CNAME) only provide IP addresses or aliases without port details.

Key Concept

DNS Service Location (SRV) Records
Estimated Time:45s
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Topics

DNS Infrastructure and Record Types

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