The answer is setting the 'peer type' to 'any' on Phase 1 and using an IP pool for address assignment. These two settings are required because a dial-up IPsec VPN server on FortiGate must accept connections from multiple unknown remote peers, which is achieved by configuring the Phase 1 interface with 'peer type any' to allow dynamic peer identification, while an IP pool provides the necessary IP addresses to remote clients when using mode-config. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this question tests your understanding of dial-up server prerequisites versus site-to-site configurations, where a common trap is confusing static peer settings with the dynamic 'any' requirement. Remember that for dial-up, the Phase 2 selector must also be set to 0.0.0.0/0 to match any destination, but the two required settings from the options are the peer type and the IP pool. A useful memory tip: "Dial-up demands dynamic—peer any and pool ready."
NSE4 Authentication and VPN Practice Question
This NSE4 practice question tests your understanding of authentication and vpn. 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 is configuring a dial-up IPsec VPN for remote users. Which TWO settings are required on the FortiGate for the dial-up server? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set 'mode-cfg' to enable on Phase 1
A dial-up server must have a Phase 1 configuration that allows multiple peers (mode-cfg or aggressive mode) and a Phase 2 that uses 0.0.0.0/0 or dynamic selectors. Additionally, an IP pool is often used to assign addresses.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Set 'mode-cfg' to enable on Phase 1
Why this is correct
Mode-config is used to assign IP addresses to clients.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set 'peer type' to 'any' on Phase 1
Why this is correct
Allows any remote peer to initiate the tunnel.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set 'aggressive mode' on Phase 1
Why it's wrong here
Aggressive mode is often used but not strictly required; main mode with mode-cfg works.
✗
Set 'auto-negotiate' to enable on Phase 2
Why it's wrong here
Auto-negotiate is not a standard parameter.
✗
Set 'pfs' to enable on Phase 2
Why it's wrong here
PFS is optional and not required for dial-up.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the NSE4 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
Got this wrong? Here's your next step.
Identify which NSE4 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.
Authentication and VPN — This question tests Authentication and VPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set 'mode-cfg' to enable on Phase 1 — A dial-up server must have a Phase 1 configuration that allows multiple peers (mode-cfg or aggressive mode) and a Phase 2 that uses 0.0.0.0/0 or dynamic selectors. Additionally, an IP pool is often used to assign addresses.
What should I do if I get this NSE4 question wrong?
Identify which NSE4 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An administrator is configuring a dialup IPsec VPN for remote users. Which two settings must be configured on the FortiGate to allow clients to connect?
easy
A.Enable XAuth for user authentication.
B.Enable Dead Peer Detection.
✓ C.Enable mode-cfg on the Phase 1 interface.
D.Enable NAT traversal.
✓ E.Create an IP pool for the remote clients.
Why C: Option C is correct because mode-config (mode-cfg) on the Phase 1 interface is required to push network configuration parameters (such as DNS, WINS, and the virtual IP address) to remote IPsec VPN clients. This setting enables the FortiGate to act as a server in a dialup VPN scenario, dynamically assigning IP addresses and other settings to clients without requiring static configuration on each client.
Last reviewed: Jun 21, 2026
Question Discussion
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This NSE4 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 NSE4 exam.
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