In networking, what does DNS stand for?

• A. Domain Name Service
• B. Domain Name System
• C. Dynamic Name System
• D. Data Network System

Answer: (B)

The concept here is the translation of human-friendly domain names into machine addresses using a naming and resolution system. DNS is the naming and resolution system that turns a URL like example.com into the numerical address devices use to reach that site. The reason this choice is the best is that “System” accurately reflects the whole, distributed mechanism—root servers, top-level domain servers, authoritative name servers, resolvers, and caching—that work together to perform lookups. Using “System” communicates that DNS is a complete framework, not just a single service. The other options don’t fit because they describe something different or incomplete: a “Service” would imply only a part of the functionality; “Dynamic” suggests a different focus on changing names; and “Data Network” isn’t related to the naming and lookup mechanism DNS provides.