Checking mail delivery records briefly | LinuC Level 1 102 Exam original practice question

1.07.4Basic

Check mail exchangers and their priorities for example.test with dig.

Keep the output concise.

Which command is appropriate?

Hint 1: Focus on resolver scope

Separate resolver directives, DNS record types, NSS sources, and query timing before comparing the settings or commands.

Hint 2: Key terms

Review the short definitions of resolver settings, DNS records, NSS sources, and query timing involved.

MX: The DNS record type that identifies mail hosts and their preference.
A: The DNS record type that maps a host name to an IPv4 address.
NS: The DNS record type that identifies authoritative name servers.
TXT: The DNS record type that stores arbitrary text associated with a domain.
+short: A dig setting that prints a concise result.
DNS record type: A category identifying the role of data returned by a DNS query.

Detailed explanation

Correctdig example.test MX +short

Correct. It queries the MX records and prints the short answer.

Incorrectdig example.test A +short

Incorrect. A queries an IPv4 address.

Incorrectdig example.test NS +short

Incorrect. NS queries authoritative name servers.

Incorrectdig example.test TXT +short

Incorrect. TXT queries text data.

An example you can run in a temporary verification environment.

dig -h 2>&1 | sed -n '1,8p'

digの問い合わせ型を指定できる使用方法

Foundation review

A DNS record that identifies mail delivery hosts and their preference.

A name server that publishes the authoritative data for a DNS zone.

A dig display option that prints a concise query result.

Question IDKL-102-1007

EnvironmentBIND dig help / 外部問い合わせなし

Last technical review2026-08-13

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