NSE7 Advanced VPN and Zero Trust Practice Question
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?
⚠ Common exam trap
NSE7 often tests the confusion between authentication methods and exchange modes; candidates may select Aggressive mode thinking it provides certificate authentication, but it is just a mode.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Signature (RSA)
Selecting Signature (RSA) in the IPsec phase 1 configuration enables the FortiGate to use digital certificates for authentication, where the remote peer's identity is validated using its certificate. This meets the requirement of validating the identity of the remote VPN peer using a certificate during IKEv2 phase 1.
Answer analysis
Option-by-option breakdown
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 an IKE phase 1 exchange mode, not an authentication method, so it cannot validate a peer certificate. It is tempting because aggressive mode is selected in the same phase 1 configuration, and suits scenarios where the responder's identity must be hidden.
- ✗
Pre-shared key
Why it's wrong here
A pre-shared key authenticates the peer through a shared secret, so FortiGate never validates a certificate. It is tempting as the simplest IKEv2 phase 1 method, and would be correct where both peers share a secret and no PKI is deployed.
- ✗
EAP
Why it's wrong here
EAP authenticates users via an external RADIUS or EAP server, not by validating a peer certificate during IKEv2 phase 1. It is tempting because EAP-TLS does involve certificates, but that is user authentication inside phase 2, not peer identity validation at phase 1.
- ✓
Signature (RSA)
Why this is correct
Signature (RSA) makes FortiGate verify the peer's certificate during IKEv2 phase 1, satisfying the requirement for certificate-based peer identity validation. The remote gateway proves possession of its private key by signing the IKEv2 exchange, and FortiGate validates that signature against a trusted CA certificate.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
Go deeper
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This NSE7 question is part of Courseiva's 718-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Fortinet exam blueprint
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.