What is DNS and what problem does it solve?

• A. DNS stores web pages locally for offline access.
• B. DNS assigns unique IDs to servers for tracking.
• C. DNS provides secure email delivery.
• D. DNS converts human readable domain names into IP addresses, enabling browsers to locate servers on the Internet.

Answer: (D)

The main idea is that the Domain Name System translates human-friendly web addresses into the numeric addresses computers use to identify each other on the network. Humans remember domain names like example.com, but computers connect using IP addresses like 93.184.216.34. DNS acts as a phonebook for the Internet, taking the name you type and returning the correct IP address so your browser can reach the right server.

This solves the everyday problem of navigating the Internet without memorizing long numbers. It also speeds things up: DNS results are cached, so repeated visits load faster, and the system is distributed and hierarchical, which keeps it scalable and resilient.

Storing web pages for offline access isn’t what DNS does, nor is assigning IDs to servers for tracking, or delivering secure email. Those involve different functions and protocols.