312-50V9 Question #431: Real Exam Question with Answer & Explanation

The correct answer is A: WHOIS. WHOIS is the publicly accessible protocol and database system used to query registration details for domain names and IP address blocks.

Question

Which system consists of a publicly available set of databases that contain domain name registration contact information?

Options

AWHOIS
BIANA
CCAPTCHA
DIETF

Explanation

WHOIS is the publicly accessible protocol and database system used to query registration details for domain names and IP address blocks.

Common mistakes.

B. IANA (Internet Assigned Numbers Authority) manages global IP address allocation, DNS root zone, and protocol parameter registries, but is not itself the query database for domain contact information.
C. CAPTCHA is a challenge-response test used to distinguish humans from automated bots on websites and has no relation to domain registration data.
D. IETF (Internet Engineering Task Force) is the standards organization that publishes RFCs, including the one defining WHOIS, but it does not operate or host domain registration contact databases.

Concept tested. WHOIS protocol and domain registration lookup

Reference. https://www.iana.org/domains/whois

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