Which of the following is associated with DNS reverse lookup zones?

The correct answer is C. PTR. PTR (Pointer) records are the DNS record type used in reverse lookup zones. A forward lookup resolves a hostname to an IP address; a reverse lookup does the opposite - it maps an IP address back to a hostname. PTR records make this possible and live in special reverse lookup…

Networking concepts

Question

Options

ACNAME
BTXT
CPTR
DMX

How the community answered

(50 responses)

A
2% (1)
B
2% (1)
C
88% (44)
D
8% (4)

Explanation

PTR (Pointer) records are the DNS record type used in reverse lookup zones. A forward lookup resolves a hostname to an IP address; a reverse lookup does the opposite - it maps an IP address back to a hostname. PTR records make this possible and live in special reverse lookup zones (e.g., in-addr.arpa). The other options serve different purposes: CNAME creates an alias for another hostname, TXT stores arbitrary text (used for SPF, DKIM, domain verification), and MX identifies mail servers for a domain.

Topics

#DNS#PTR record#reverse lookup#DNS record types

Community Discussion

No community discussion yet for this question.

Full N10-005 Practice