DNS Records - CompTIA Network+ N10-009 - 3.4

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10 Terms

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DNS Records

• Resource Records (RR) - The database records of domain name services

• Over 30 record types - IP addresses, certificates, host alias names, etc.

• These are important and critical configurations - Make sure to check your settings, backup, and test!

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Start forward lookup file

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Start of Authority Record (SOA)

Describes the DNS zone details

Structure

- IN SOA (Internet Zone, Start of Authority) with name of zone

- Serial number

- Refresh, Retry, and expiry time frames

- Caching duration/TTL

<p>Describes the DNS zone details</p><p>Structure</p><p>- IN SOA (Internet Zone, Start of Authority) with name of zone</p><p>- Serial number</p><p>- Refresh, Retry, and expiry time frames</p><p>- Caching duration/TTL</p>
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Address Records (A) or (AAAA)

Defines the IP of a host

- Most popular query

A records are for IPv4

- Modify the A record to change the host name

AAAA records are for IPv6 addresses

- The same DNS server, different accounts

<p>Defines the IP of a host</p><p>- Most popular query</p><p>A records are for IPv4</p><p>- Modify the A record to change the host name</p><p>AAAA records are for IPv6 addresses</p><p>- The same DNS server, different accounts</p>
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Canonical name records (CNAME)

A name is an alias of another, canonical name

- One physical, server multiple services

<p>A name is an alias of another, canonical name</p><p>- One physical, server multiple services</p>
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mail exchanger record (MX)

Determines the host name for the mail server

- This isn't an IP address; it's a name

<p>Determines the host name for the mail server</p><p>- This isn't an IP address; it's a name</p>
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MX Record

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Text Record (TXT)

Human readable text information

- Useful public information

SPF protocol (Sender Policy Framework)

- Prevent mail spoofing

- Mail servers check that incoming mail really did come from the authorized host

DKIM (Domain Keys Identified Mail)

- Digitally sign your outgoing mail

- Validated by the mail server

- Put your public key in the DKIM TXT record

<p>Human readable text information</p><p>- Useful public information</p><p>SPF protocol (Sender Policy Framework)</p><p>- Prevent mail spoofing</p><p>- Mail servers check that incoming mail really did come from the authorized host</p><p>DKIM (Domain Keys Identified Mail)</p><p>- Digitally sign your outgoing mail</p><p>- Validated by the mail server</p><p>- Put your public key in the DKIM TXT record</p>
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Name Server Records (NS)

List the name servers for a domain

- NS Records point to the name of the server

<p>List the name servers for a domain</p><p>- NS Records point to the name of the server</p>
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Pointer Record (PTR)

The reverse of an A or AAAA record

- Added to a reverse map zone file

<p>The reverse of an A or AAAA record</p><p>- Added to a reverse map zone file</p>