CompTIA Network+ (N10-009) — Question 194

An organization wants to ensure that incoming emails were sent from a trusted source. Which of the following DNS records is used to verify the source?

Answer options

• A. TXT
• B. AAA
• C. CNAME
• D. MX

Correct answer: A

Explanation

The correct answer is A, TXT records are used for various purposes including email verification methods such as SPF and DKIM. The other options, such as AAA, CNAME, and MX, serve different functions related to IP address mapping, aliasing, and mail exchange respectively, but do not specifically verify email sender authenticity.