CompTIA A+ Core 1 (220-1101) — Question 550

Which of the following is an email authentication method designed to detect email spoofing by attaching a digital signature to outgoing email?

Answer options

• A. SPF
• B. DKIM
• C. DNS pointer
• D. MX records

Correct answer: B

Explanation

The correct answer is DKIM, which stands for DomainKeys Identified Mail, and it adds a digital signature to emails to verify their authenticity. SPF (Sender Policy Framework) is used to prevent email spoofing but does not involve digital signatures. DNS pointer and MX records are related to email routing and do not provide authentication features.