This NSE7 practice question tests your understanding of advanced threat protection. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization wants to implement email authentication to prevent spoofing. Which TWO standards should they configure? (Choose two.)
SPF
SPF specifies which servers are authorized to send email.
DMARC
Why wrong: DMARC uses SPF and DKIM; it is not a standalone authentication.
TLS
Why wrong: TLS encrypts email in transit, not authentication.
STARTTLS
Why wrong: Also encryption, not authentication.
DKIM
DKIM adds a digital signature to verify email integrity.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SPF
SPF (Sender Policy Framework) is correct because it allows the domain owner to publish a list of authorized sending IP addresses in a DNS TXT record, enabling receiving mail servers to verify that the email originated from an approved source. DKIM (DomainKeys Identified Mail) is correct because it adds a digital signature to email headers, which the receiving server validates against a public key published in DNS, ensuring the message was not tampered with and truly came from the claimed domain. Together, SPF and DKIM form the foundational layers of email authentication that DMARC builds upon.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
SPF
Why this is correct
SPF specifies which servers are authorized to send email.
Related concept
Read the scenario before looking for a memorised answer.
DMARC
Why it's wrong here
DMARC uses SPF and DKIM; it is not a standalone authentication.
TLS
Why it's wrong here
TLS encrypts email in transit, not authentication.
STARTTLS
Why it's wrong here
Also encryption, not authentication.
DKIM
Why this is correct
DKIM adds a digital signature to verify email integrity.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Fortinet often tests the distinction between authentication standards (SPF, DKIM) and transport security protocols (TLS, STARTTLS), leading candidates to mistakenly select TLS or STARTTLS as anti-spoofing measures when they only provide encryption, not sender verification.
Detailed technical explanation
SPF uses a DNS TXT record (e.g., v=spf1 ip4:192.0.2.0/24 -all) to declare authorized senders, but it fails when emails are forwarded because the forwarding server's IP may not be in the original SPF record, causing false failures. DKIM uses asymmetric cryptography: the signing server hashes parts of the email (e.g., From, Subject, body) and signs with a private key, while the verifier retrieves the public key from the domain's DNS (e.g., default._domainkey.example.com). In real-world scenarios, SPF alone is insufficient for forwarded emails, and DKIM alone does not prevent a domain from being used in the From header without authorization—hence both are needed.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Advanced Threat Protection — This question tests Advanced Threat Protection — Read the scenario before looking for a memorised answer..
The correct answer is: SPF — SPF (Sender Policy Framework) is correct because it allows the domain owner to publish a list of authorized sending IP addresses in a DNS TXT record, enabling receiving mail servers to verify that the email originated from an approved source. DKIM (DomainKeys Identified Mail) is correct because it adds a digital signature to email headers, which the receiving server validates against a public key published in DNS, ensuring the message was not tampered with and truly came from the claimed domain. Together, SPF and DKIM form the foundational layers of email authentication that DMARC builds upon.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.
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