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Question

Difficulty: EasyIP Addressing Services

A network technician needs to configure a DNS server to enable hostnames to be resolved from known IP addresses during network troubleshooting and log auditing. Which DNS record type should be created to support this reverse lookup functionality?

  1. PTR recordAnswer
  2. B
    A record
  3. C
    AAAA record
  4. D
    MX record

Answer

PTR record
PTR (Pointer) records provide reverse DNS resolution by mapping IP addresses back to fully qualified domain names.

Step-by-Step Solution

1
Analyze the service requirement
The target requirement is resolving a host's domain name starting from an IP address (reverse DNS lookup).
Understanding whether the operational need is forward or reverse resolution determines the record type.
2
Select the appropriate DNS resource record type
PTR records store mapping entries specifically for reverse DNS resolution.
Forward records (A/AAAA) convert names to IP addresses, while PTR records map IP addresses to canonical hostnames.

Key Concept

DNS Reverse Lookup and PTR Records
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Topics

IP Addressing Services

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