Domain Name System

Question 1

What is Name Resolution

Answer 1

Mapping fully-qualified domain names or FQDNs to IP addresses

Question 2

FQDN

Answer 2

Fully-qualified domain name

Question 3

Name Resolution Process

Answer 3

• Hosts file
• Local Resolver Cache
• DNS Servers (Root first, TLD, SLD)
  
  • Locally configured DNS server (Private or ISP DNS server)
  • Root hint
  • Top-level Domain (TLD)
  • Second-level domain or host’s domain (SLD, typically organizations)

Question 4

Address (A)

Answer 4

Hostname-to-IPv4address

Question 5

Quad A (AAAA)

Answer 5

Hostname-to-IPv6address

Question 6

Pointer Records (PTR)

Answer 6

IPv4-to-HostName

Question 7

Mail exchanger (MX)

Answer 7

Designats who on a network can send emails

Question 8

Canonical (CNAME)

Answer 8

Alias-to-Address-Record

Question 9

Text (TXT)

Answer 9

attaches readable text to be associated with specific Domain Names

Question 10

Three types of SPAM Management

Answer 10

DKIM
SPF
DMARC

Question 11

What is DKIM?

Answer 11

DomainKeys Identified Mail

Public-key cryptology to secure DNS records
Domain owner is verified

Question 12

What is SPF?

Answer 12

Sender Policy Framework

It contains a list of all the IP addresses that are authorized to send email on behalf of the domain owner.

Question 13

What is DMARC?

Answer 13

Domain-based Message Authentication, Reporting, and Conformance

Requires either an SPF for DKIM record
Reports the status of the SPF or DKIM record