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Question

Difficulty: EasyDNS Infrastructure and Record Types

A systems engineer queries an internal name server using the `nslookup` command to verify host address resolution for a database server:

text
> nslookup db01.contoso.local
Server: dns1.contoso.local
Address: 10.0.0.2

Name: db01.contoso.local
Address: 10.0.1.50

Which DNS resource record type provides this direct mapping of a hostname to an IPv4 address?

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

Answer

An A record is used to resolve a hostname directly to an IPv4 address.
An A (Address) record is the fundamental DNS resource record type used to map a domain name or hostname to a standard 32-bit IPv4 address. In the command output, the hostname `db01.contoso.local` resolves directly to `10.0.1.50`, which represents a standard IPv4 forward lookup.

Step-by-Step Solution

1
Analyze the output snippet from the `nslookup` command line tool.
The query for `db01.contoso.local` returned the IP address `10.0.1.50`.
Identifying the target data format (IPv4 address) is necessary to determine the corresponding DNS record type.
2
Evaluate the address format returned by the DNS query.
The address `10.0.1.50` is a 32-bit IPv4 address.
IPv4 host resolution requires a specific forward lookup resource record type.
3
Select the record type responsible for IPv4 host mapping.
The A (Address) record matches IPv4 forward mappings.
An A record specifically binds a domain name to an IPv4 address in DNS zone files.

Key Concept

DNS A Record IPv4 Resolution
Estimated Time:45s
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Topics

DNS Infrastructure and Record Types

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