CompTIA Network+ (N10-009) Exam-Style Practice Question 2026

Correct Answer: C. MX
MX (Mail Exchanger) records specify which mail server is responsible for receiving email for a domain. When the mail server moves to a new cloud location with a new address, the MX record must be updated to point to the new mail server so incoming email is routed correctly.

A. NS — Name Server records point to the authoritative DNS servers for the domain; updating these would change where the domain's DNS is hosted, not where mail is delivered.
B. PTR — A reverse DNS record mapping an IP to a hostname; used for reverse lookups and spam filtering checks, but not the record that directs inbound mail delivery.
D. A — Maps a hostname to an IPv4 address; would need updating if the mail server's hostname changes, but the MX record is what specifically directs email traffic to the mail server.

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