Understanding DNS and IP Addresses

The video tutorial explains how computers use numbers, specifically IP addresses, for identification over a network. It introduces DNS (Domain Name System) as a solution to bridge the gap between human-friendly domain names and computer-friendly IP addresses. The tutorial details the DNS resolution process, including the roles of resolver servers, root servers, TLD servers, and authoritative name servers. It also highlights the caching mechanism to optimize future queries.

How do computers identify each other over a network?

• By using symbols

• By using numbers

• By using names

• By using colors

What does DNS stand for?

• Domain Name System

• Digital Network System

• Data Name Service

• Domain Network Service

What is the primary function of DNS?

• To store website data

• To manage internet traffic

• To resolve domain names to IP addresses

• To provide internet security

What is the role of the resolver server in DNS resolution?

• To find IP addresses in its cache

• To provide internet access

• To store domain names

• To manage root servers

How many sets of root servers are there in the DNS hierarchy?

• 10

• 12

• 13

• 15

What does the TLD server manage?

• Internet traffic

• IP addresses

• Domain names

• Top-level domains like .com, .net

What is the next step if the TLD server does not know the IP address?

• It directs the query to the root server

• It sends an error message

• It directs the query to the authoritative name server

• It stores the query for later

What is the role of the authoritative name server?

• To provide the final IP address for a domain

• To manage root servers

• To resolve domain names to numbers

• To store DNS records

What happens after the resolver receives the IP address from the authoritative name server?

• It stores the IP address in its cache

• It sends the IP address to the root server

• It sends an error message

• It deletes the IP address

Why is caching important in DNS resolution?

• To manage internet traffic

• To store domain names

• To speed up future queries

• To provide security