World of Computer Networking Your CCNA start - Reverse Domain Name System (DNS) Query Resolution Process

The video tutorial explains DNS queries and reverse DNS, highlighting how they work and their practical applications. It provides examples of reverse DNS requests and discusses their use in mail servers to filter spam. The tutorial also demonstrates using traceroute to resolve DNS and explains PTR records, which are essential for reverse DNS functionality.

What is the primary purpose of a DNS query?

• To trace the route of data packets

• To block spam emails

• To find the IP address of a domain name

• To find the domain name of an IP address

How does reverse DNS differ from a standard DNS query?

• It finds the IP address from a domain name

• It traces the route of data packets

• It blocks spam emails

• It finds the domain name from an IP address

Why might an email server reject an email based on reverse DNS?

• The email is sent during non-business hours

• The email contains a virus

• The sender's IP address has no corresponding reverse DNS record

• The email is too large

What utility can be used to see the path data takes to reach a domain?

• traceroute

• ping

• nslookup

• whois

What is a PTR DNS record used for?

• To map a domain name to an IP address

• To trace the route of data packets

• To map an IP address to a domain name

• To block spam emails