CompTIA Network+ (N10-007) — Question 220

Which of the following DNS records needs to be configured for SMTP traffic?

Answer options

• A. MX
• B. CNAME
• C. AAAA
• D. PTR

Correct answer: A

Explanation

The correct answer is MX because Mail Exchange (MX) records are specifically designed to direct email traffic to the appropriate mail servers. The other options, CNAME, AAAA, and PTR, serve different purposes such as aliasing, IPv6 address mapping, and reverse DNS lookups, respectively, and are not used for routing SMTP traffic.