Understanding DNS and Domain Resolution

The video tutorial introduces the Domain Name System (DNS), explaining its role in mapping domain names to IP addresses. It highlights the importance of domain names for user convenience and the dynamic nature of IP addresses. The DNS resolution process is detailed, describing how requests are handled through a hierarchical architecture involving root and authoritative servers. The video also touches on DNS caching, which improves efficiency by storing frequently accessed data. The tutorial sets the stage for further exploration of recursive and iterative modes in DNS.

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

• To store website data

• To host web applications

• To map domain names to IP addresses

• To provide internet security

Why do users prefer domain names over IP addresses?

• Domain names are easier to remember

• IP addresses are static

• Domain names are shorter

• IP addresses are more secure

What happens if a website changes its IP address but keeps the same domain name?

• The website becomes inaccessible

• The website loses its data

• Users need to update their bookmarks

• The domain name still directs users to the website

What is the role of a root server in DNS architecture?

• To store all domain names

• To resolve domain names into IP addresses

• To host web applications

• To provide internet access

How many root servers are there worldwide?

• 10

• 13

• 15

• 20

In DNS resolution, what is the purpose of authoritative servers?

• To host web applications

• To store IP addresses and domain names

• To provide internet access

• To store all domain names

What is the process of resolving a domain name to an IP address called?

• IP allocation

• Domain mapping

• Server hosting

• Name resolution

What is the role of a resolver in DNS?

• To resolve domain names into IP addresses

• To map IP addresses to domain names

• To provide internet access

• To host websites

What is the benefit of DNS caching by ISPs?

• It provides better security

• It makes DNS resolution faster

• It reduces the load on root servers

• It increases internet speed

What happens when a domain name is resolved for the first time?

• It is stored in the browser cache

• It is sent to the root server

• It is resolved by the ISP

• It is stored in the computer's memory