World of Computer Networking Your CCNA start - Facts about Domain Names

The video tutorial explains the DNS service from the perspective of a client and server. It highlights the simplicity of DNS requests and responses, followed by a discussion on DNS facts, such as the number of active domains, domain expiration, and the complexity of managing DNS records. The tutorial concludes with the challenges of storing DNS data on a single server and introduces the hierarchical structure of the worldwide DNS registry.

What is the primary function of a DNS client?

• To store domain names

• To request an IP address for a domain name

• To manage domain expiration

• To register new domains

Approximately how many active domains exist worldwide?

• 100 million

• 200 million

• 400 million

• 600 million

What is a common characteristic of DNS records for a domain?

• They can change over time

• They are always deleted after a year

• They never change

• They are static

Why is it difficult to maintain all DNS records on a single server?

• Because servers are not reliable

• Due to the lack of DNS clients

• Due to the high number of active domains and records

• Because DNS records are too small

What structure does the worldwide DNS registry use to manage records?

• Circular structure

• Flat structure

• Random structure

• Hierarchical structure