World of Computer Networking Your CCNA start - nslookup Utility

The video tutorial explains DNS packets, focusing on DNS queries and responses. It introduces the nslookup utility, demonstrating how to resolve domain names to IP addresses using examples like google.com, instagram.com, and cloudflare.com. The tutorial also covers changing DNS settings and understanding the role of routers in DNS resolution. Finally, it hints at using Wireshark for further DNS analysis.

What is the primary function of the nslookup utility?

• To configure firewall settings

• To monitor network traffic

• To resolve domain names to IP addresses

• To encrypt DNS queries

Which port is typically used for DNS queries?

• Port 443

• Port 80

• Port 25

• Port 53

What role does a wireless router play in DNS resolution?

• It encrypts DNS queries

• It acts as a DNS server and forwards requests to an ISP's DNS server

• It blocks DNS requests

• It changes the IP address of the DNS server

What happens when multiple IP addresses are returned for a single domain?

• The computer can use any of the IP addresses to access the domain

• The domain cannot be accessed

• Only the first IP address is valid

• The DNS query fails

What tool is mentioned for analyzing DNS queries and responses?

• Netstat

• Wireshark

• Traceroute

• Ping