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Question

Difficulty: EasyDNS Infrastructure and Record Types

A network administrator runs the `nslookup` command to check the mail server configuration for an enterprise domain and obtains the following output:

text
> set type=MX
> company.com
Server: dns1.internal.net
Address: 10.0.0.53

Non-authoritative answer:
company.com mail exchanger = 10 mail.company.com

Which DNS record type must be configured to map `mail.company.com` directly to its corresponding IPv4 address?

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

Answer

The host requires an A record to resolve the mail server hostname to an IPv4 address.
An A record specifically maps a domain name or hostname to a 32-bit IPv4 address, which is required for client systems to initiate direct IP connectivity to `mail.company.com` over IPv4.

Step-by-Step Solution

1
Analyze the MX record output
The MX lookup returns the hostname `mail.company.com` as the mail exchanger for `company.com`.
MX records specify destination mail servers by hostname, requiring a secondary lookup to find their IP address.
2
Identify the target address family
The requirement specifies resolving `mail.company.com` to an IPv4 address.
Standard IPv4 host resolution is performed using Host Address (A) records.

Key Concept

DNS Record Functions and Resolution
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Topics

DNS Infrastructure and Record Types

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