CompTIA A+ Core 1 (CA1-005) — Question 5

A systems administrator needs to address risks associated with corporate brand impersonation via email. The systems administrator wants a method that permits recipient servers to validate the source authenticity of emails received. Which of the following is the most appropriate?

Answer options

• A. SPF
• B. DKIM
• C. S/MIME
• D. DMARC

Correct answer: D

Explanation

The correct answer is DMARC as it enables receiving mail servers to check the alignment of the sender's domain with the email source, providing a way to combat impersonation. SPF and DKIM are mechanisms that help authenticate emails but do not provide the same level of reporting and alignment checks as DMARC. S/MIME is focused on email encryption and signing rather than brand impersonation verification.