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Difficulty: MediumDNS Infrastructure and Record Types

A network administrator is configuring DNS resource records for a newly deployed service hostname `app.example.com`. The service requires mapping the domain directly to an IPv6 address and publishing domain ownership verification text. A diagnostic `dig` command yields the following output:

;; QUESTION SECTION:
;app.example.com. IN ANY

;; ANSWER SECTION:
app.example.com. 3600 IN A 192.0.2.45

Which TWO of the following DNS record types must the administrator add to the authoritative zone file to satisfy these technical requirements?

  1. AAAA recordAnswer
  2. TXT recordAnswer
  3. C
    PTR record
  4. D
    SRV record
  5. E
    CNAME record

Answer

The administrator must add an AAAA record to resolve the hostname to an IPv6 address and a TXT record to publish domain ownership verification text.
To satisfy both requirements, an AAAA record is required to map the hostname to its corresponding 128-bit IPv6 address, and a TXT record is required to hold the domain verification text string.

Step-by-Step Solution

1
Analyze the technical requirements for hostname address mapping
Mapping `app.example.com` to an IPv6 address requires an IPv6 host record.
An AAAA (quad-A) record specifically handles 128-bit IPv6 address resolution for domain names.
2
Analyze the technical requirements for verification data storage
Publishing verification strings requires an arbitrary text storage record.
TXT records allow domain owners to store free-form text strings in DNS zone files for third-party domain validation and security policies.

Key Concept

DNS Resource Record Types (AAAA and TXT)
Estimated Time:1m 30s
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Topics

DNS Infrastructure and Record Types

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