Understanding Domain Name System Concepts

The video tutorial explains the Domain Name System (DNS), its role in translating domain names to IP addresses, and its hierarchical structure. It covers the configuration of DNS servers, both internal and external, and the processes of recursive and iterative DNS queries. The tutorial also discusses the authority of DNS query responses and the importance of Time to Live (TTL) settings. Finally, it demonstrates forward and reverse DNS lookups using the dig command.

What is the primary function of the Domain Name System (DNS)?

• To store website content

• To manage email servers

• To provide internet security

• To translate domain names into IP addresses

How many root server clusters are there in the DNS system?

• 100

• 1000

• 13

• 10

What does FQDN stand for in the context of DNS?

• First Query Domain Name

• Fast Query Domain Name

• Fully Qualified Domain Name

• Full Quality Domain Name

Which of the following is an example of a top-level domain (TLD)?

• .com

• www

• mail

• http

What is the role of an internal DNS server?

• To resolve domain names within a local network

• To manage external web traffic

• To provide cloud storage

• To encrypt data

In a recursive DNS query, who performs the majority of the work?

• The user's device

• The local DNS server

• The root server

• The web server

What is a key difference between recursive and iterative DNS queries?

• Iterative queries are cached longer

• Iterative queries involve multiple DNS servers

• Recursive queries are only for internal networks

• Recursive queries are faster

What does a non-authoritative DNS answer indicate?

• The answer is encrypted

• The answer is from the root server

• The answer is from a cached source

• The answer is incorrect

What is the purpose of the time-to-live (TTL) value in DNS?

• To measure server response time

• To determine the lifespan of a DNS record in the cache

• To encrypt DNS queries

• To prioritize DNS queries

What is a reverse DNS query used for?

• To speed up DNS resolution

• To find the domain name associated with an IP address

• To encrypt DNS data

• To find the IP address of a domain name