CompTIA Network+ (N10-009) — Question 443

Which of the following record types does an IP-to-name lookup use in DNS?

Answer options

• A. NS
• B. PTR
• C. A
• D. CNAME

Correct answer: B

Explanation

The correct answer is B, PTR, as it is specifically designed for reverse DNS lookups, converting IP addresses back to their associated domain names. The other options, NS, A, and CNAME, serve different purposes: NS records define name servers for a domain, A records map domain names to IP addresses, and CNAME records create aliases for existing domain names.