DNS Record Types to know for the exam

 DNS RECORD TYPES

Make sure you know the following DNA record types for this exam and how they are used:

A: host (IPv4). Maps the name to an IPv4 address.

AAAA: host (IPv6) Maps the name to an IPv6 address.

CNAME: (Canonical Name): Alias. Example: Sites that use www as the hostname of a web server might internally call it something else, such as Dallwebserver1.

MX: Mail Exchanger. This is used for an email server.

NS: Name Server. Provides a list of the authoritative DNS servers responsible for the domain you are trying to query.

PTR: Pointer. This is a reverse record; it resolves IPv4 or IPv6 addresses to domain names.

SOA: Start of Authority. Keeps track of all of the DNS changes to help with replication.

TXT: Text. Stores descriptive information about the domain in a text format. 

SPF stands for Sender Policy Framework. It helps prevent spammers from sending emails from your domain using the email addresses of your email servers.