DNS Flashcards

1
Q

Name the 9 common DNS record types

A

A
AAAA
CNAME
NS
PTR
MX
SRV
TXT
SOA

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2
Q

What is the purpose of a DNS A Record?

A

It maps an FQDN to an IPv4 IP address

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3
Q

What is the purpose of a DNS AAAA Record?

A

It maps an FQDN to an IPv6 IP address

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4
Q

What is the purpose of a DNS CNAME Record?

A

Canonical name - an alias that is used to “hide” the actual host name

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5
Q

What is the purpose of a DNS NS Record?

A

The name of an authoritative name server. This is a name server (DNS server) for a specific zone which may, in turn, reference an A record.

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6
Q

What is the purpose of a DNS PTR Record?

A

Maps and IP address to an FQDN; This is the reverse of an A record or AAAA record

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7
Q

What is the purpose of a DNS MX Record?

A

Mail Exchange - this specifies a mail server, such as mail.domain.com

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8
Q

What is the purpose of a DNS SRV Record?

A

Service record which contains a service, protocol (TCP/UDP/SSL) Priority, Weight, TTL, and Name

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9
Q

What is the purpose of a DNS TXT Record?

A

This just contains a string of text. Sometimes used by providers or cloud services for temporary domain discovery.

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10
Q

What is the purpose of a DNS SOA Record?

A

Start of Authority - Includes zone details like authoritative server, TTL, owner, and others.

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