Quick Answer
The answer is to configure `set pfs enable` followed by `set dhgrp 14` under the IPsec phase 2 proposal. This is correct because Perfect Forward Secrecy ensures that if a long-term private key is compromised, past session keys remain secure by generating new keying material during child SA rekeying using a Diffie-Hellman exchange; DH group 14 specifies a 2048-bit modular exponential group, providing strong cryptographic protection. On the Fortinet NSE 7 Advanced Security NSE7 exam, this tests your ability to distinguish between phase 2 encryption/integrity settings and PFS configuration—a common trap is confusing `set proposal` with PFS commands, as the former only defines cipher suites. Remember the memory tip: "PFS needs its own pair—enable it, then pick the group."
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.
A FortiGate has an IPsec VPN with a remote peer that uses IKEv2. The administrator wants to ensure that child SA rekeying uses PFS (Perfect Forward Secrecy) with Diffie-Hellman group 14. Which CLI command should the administrator configure on the FortiGate's phase 2 proposal?
set auto-negotiate enable; set dh-group 14
Why wrong: Auto-negotiate is not related to PFS.
set pfs enable; set dhgrp 14
This correctly enables PFS and sets the Diffie-Hellman group to 14.
set proposal aes256-sha256 dh-group 14
Why wrong: The dh-group parameter is not part of the proposal string; it is a separate command.
set pfs enable; set dh-group 14
Why wrong: The correct CLI parameter is 'dhgrp', not 'dh-group'.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
set pfs enable; set dhgrp 14
To enable PFS with DH group 14 on the phase 2 proposal, the correct CLI command is 'set pfs enable' and 'set dhgrp 14'. The command 'set proposal aes256-sha256' defines encryption/integrity, not PFS. The other options do not set PFS correctly.
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.
set auto-negotiate enable; set dh-group 14
Why it's wrong here
Auto-negotiate is not related to PFS.
set pfs enable; set dhgrp 14
Why this is correct
This correctly enables PFS and sets the Diffie-Hellman group to 14.
Related concept
Read the scenario before looking for a memorised answer.
set proposal aes256-sha256 dh-group 14
Why it's wrong here
The dh-group parameter is not part of the proposal string; it is a separate command.
set pfs enable; set dh-group 14
Why it's wrong here
The correct CLI parameter is 'dhgrp', not 'dh-group'.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The dh-group parameter is not part of the proposal string; it is a separate command.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the NSE7 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which NSE7 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Advanced VPN and Zero Trust — This question tests Advanced VPN and Zero Trust — Read the scenario before looking for a memorised answer..
The correct answer is: set pfs enable; set dhgrp 14 — To enable PFS with DH group 14 on the phase 2 proposal, the correct CLI command is 'set pfs enable' and 'set dhgrp 14'. The command 'set proposal aes256-sha256' defines encryption/integrity, not PFS. The other options do not set PFS correctly.
Identify which NSE7 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
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