What are SPF, DKIM, and DMARC used for in email security?

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Study for the Information Systems Technician Second Class (IT2) Advancement Exam with our extensive set of flashcards and multiple-choice questions. Each question is accompanied by hints and thorough explanations. Enhance your knowledge and prepare for success!

Multiple Choice

What are SPF, DKIM, and DMARC used for in email security?

Explanation:
These mechanisms exist to prove a message really comes from the domain it claims and to prevent spoofing. SPF checks that the sending server is authorized to send on behalf of the domain by looking up a DNS record. DKIM signs the message with a private key, and the recipient uses the public key in DNS to verify the signature and that the content hasn’t been altered in transit. DMARC sits on top of SPF and DKIM and adds a policy layer: it requires that the domain in the From header aligns with the domain verified by SPF or DKIM, and it allows domain owners to publish what should happen to messages that fail authentication (none, quarantine, or reject) while also delivering reporting data about authentication results. Because DMARC coordinates SPF and DKIM checks and enforces domain-based policy with feedback, it best captures the combined function of these mechanisms. (ARC is related but serves a different purpose about preserving authentication results across forwarders.)

These mechanisms exist to prove a message really comes from the domain it claims and to prevent spoofing. SPF checks that the sending server is authorized to send on behalf of the domain by looking up a DNS record. DKIM signs the message with a private key, and the recipient uses the public key in DNS to verify the signature and that the content hasn’t been altered in transit. DMARC sits on top of SPF and DKIM and adds a policy layer: it requires that the domain in the From header aligns with the domain verified by SPF or DKIM, and it allows domain owners to publish what should happen to messages that fail authentication (none, quarantine, or reject) while also delivering reporting data about authentication results. Because DMARC coordinates SPF and DKIM checks and enforces domain-based policy with feedback, it best captures the combined function of these mechanisms. (ARC is related but serves a different purpose about preserving authentication results across forwarders.)

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