GIAC Security Leadership Certification (GSLC) — Question 30

What email validation technology only allows email from systems specified in DNS?

Answer options

• A. ARC
• B. SPF
• C. DMARC
• D. HMAC

Correct answer: C

Explanation

The correct answer is DMARC, which is designed to work with SPF and DKIM to ensure that emails come from legitimate sources specified in DNS. ARC and HMAC are not primarily focused on DNS validation, and SPF alone does not provide the same level of reporting and policy enforcement as DMARC.