Quick Answer
The answer is Signature (RSA). This is the correct authentication method because IKEv2 certificate authentication relies on RSA signatures to verify peer identity during phase 1, where each side signs a hash of exchanged nonces and the other’s public key, proving possession of the corresponding private key without transmitting the key itself. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding of how FortiGate validates remote VPN peers using certificate-based trust rather than pre-shared secrets; a common trap is confusing “signature” with “pre-shared key” or assuming EAP is required for certificate exchange. Remember that IKEv2 mandates RSA signatures for certificate authentication—think “sign the hash, prove the key”—and that FortiGate’s phase 1 configuration explicitly lists “Signature (RSA)” as the peer authentication option for this purpose.
This NSE7 practice question tests your understanding of advanced vpn and zero trust. 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 administrator wants to ensure that FortiGate validates the identity of the remote VPN peer using a certificate during IKEv2 phase 1. Which authentication method should the administrator select in the IPsec phase 1 configuration?
Aggressive mode
Why wrong: Aggressive mode is a negotiation mode, not an authentication method.
Pre-shared key
Why wrong: PSK uses a shared secret, not certificates.
EAP
Why wrong: EAP is used for extended authentication, not primarily for peer identity validation.
Signature (RSA)
Signature authentication uses digital certificates to verify identity.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Signature (RSA)
IKEv2 supports certificate-based authentication (RSA signature) for peer identity verification.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Aggressive mode
Why it's wrong here
Aggressive mode is a negotiation mode, not an authentication method.
Pre-shared key
Why it's wrong here
PSK uses a shared secret, not certificates.
EAP
Why it's wrong here
EAP is used for extended authentication, not primarily for peer identity validation.
Signature (RSA)
Why this is correct
Signature authentication uses digital certificates to verify identity.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE7 NAT questions on configuration and troubleshooting.
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FAQ
Advanced VPN and Zero Trust — This question tests Advanced VPN and Zero Trust — Static NAT maps one inside address to one outside address..
The correct answer is: Signature (RSA) — IKEv2 supports certificate-based authentication (RSA signature) for peer identity verification.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE7 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 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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