2.6a - DNS Configuration: Professor Messer

DNS

Translates human-readable domain names into computer-readable IP addresses.

Root DNS

The highest level in the DNS hierarchy, denoted as '.'.

Top-Level Domains (TLDs)

The domains directly beneath the root, such as .com, .net, and .org.

Second-Level Domains (SLDs)

Domains directly beneath TLDs that include regular hostnames like 'website names'.

Subdomains

Domains that are found beneath SLDs, for example, mail.website.com.

A Record

DNS records for IPv4 that contain an FQDN with an IPv4 address.

AAAA Record

DNS records for IPv6 that contain an FQDN with an IPv6 address.

Mail Exchanger (MX)

Defines the hostname for a mail server, typically a subdomain.

Text Record (TXT)

Contains human-readable text information, often used for domain verification.

DomainKeys Identified Mail (DKIM)

Provides a public key to verify a domain's outgoing mail.

Sender Policy Framework (SPF)

Lists all servers authorized to send emails for a domain, preventing spoofing.

Domain-based Message Authentication, Reporting, and Conformance (DMARC)

Provides instructions to email servers on handling emails that fail authentication.