CompTIA A+ Certification Core 1 (220-1101) - Understanding DNS

The video tutorial explains the concept of DNS as the Internet's contact list, similar to how we use contact lists on phones. It covers the transition from host files to DNS, the hierarchy of DNS servers, and the process of domain name resolution. The tutorial also discusses DNS caching, domain registration, and the role of DNS in email authentication using technologies like DMARC, DKIM, and SPF.

What is the primary function of DNS in the context of the Internet?

• To manage email servers

• To store personal contact information

• To translate domain names into IP addresses

• To provide internet access

What did DNS replace as the primary method for resolving domain names?

• Web browsers

• Email servers

• Host files

• IP address lists

What is the role of root servers in the DNS hierarchy?

• To store all domain names

• To provide internet access

• To manage email traffic

• To control the top-level domain names

How does caching improve the efficiency of DNS queries?

• By increasing the speed of internet connections

• By eliminating the need for domain names

• By reducing the number of DNS servers

• By storing frequently accessed IP addresses

What is required to register a unique domain name?

• A payment to a registrar

• A valid email address

• An IP address

• A web server

What is the character limit for DNS domain names, including dots?

• 1024 characters

• 512 characters

• 256 characters

• 128 characters

What does DMARC stand for in the context of DNS?

• Domain Messaging and Authentication Control

• Domain Management and Reporting Control

• Domain Mail Authentication Reporting and Conformance

• Domain Message Authentication Reporting and Conformance

How does DKIM help in email authentication?

• By providing a backup of the email

• By blocking spam emails

• By signing the message to verify the sender

• By encrypting the entire email

What is the purpose of the Sender Policy Framework (SPF) in DNS?

• To manage domain registrations

• To verify authorized mail servers

• To provide internet access

• To encrypt email messages

Which technology helps prevent domain spoofing by verifying the sender's domain?

• DNSSEC

• DMARC

• SSL

• TLS