On the Internet, the database that stores the names and addresses of different hosts is called ________.

Question

UnlockIAS · Accepted Answer

Correct — B, Domain Name System (DNS). DNS is the internet's distributed, hierarchical directory that maps human-readable hostnames (such as www.example.com) to their numeric IP addresses and stores the associated host records — without it, users would have to remember raw IP addresses for every site. The technically correct expansion of the acronym is 'Domain Name System', not 'Domain Name Service'.

Why the other options are wrong — (a) A commonly heard but technically imprecise expansion of the acronym — the standard term is 'Domain Name System'.  (c) Not a real networking term — DNS is a naming/directory system, not a file system.  (d) Wrong — option B, Domain Name System (DNS), is exactly the database being described.

Concept: DNS (Domain Name System) is the internet's naming database, organised as a distributed hierarchy of servers (root, top-level domain, authoritative). It translates human-friendly domain names into the numeric IP addresses that computers use to route traffic, functioning like a phonebook for the internet.

State PCS 2021 Q29 — Science & Technology PYQ with Answer

State PCS 2021 Q29 — Science & Technology PYQ with Answer