The answer is that the FortiGate will accept any peer identity during IKE authentication. This output from the 'diagnose vpn ike config' command means the peer-id field, which normally specifies the expected identity of the remote peer, is set to 'any', so the FortiGate does not enforce a specific peer identifier during Phase 1 negotiation. This configuration is commonly used when the remote peer has a dynamic IP address or when certificates are used with subject matching disabled, as it allows the VPN tunnel to establish without requiring a fixed identity match. On the Fortinet NSE 4 Network Security Professional exam, this concept tests your understanding of IKE authentication parameters and how peer-id validation affects IPsec VPN troubleshooting. A common trap is assuming 'peer-id: any' means the FortiGate ignores authentication entirely, but it only relaxes the identity check while still requiring valid pre-shared keys or certificates. Memory tip: think of 'any' as an open door—it lets any peer in, but they still need the right key.
NSE4 Authentication and VPN Practice Question
This NSE4 practice question tests your understanding of authentication and vpn. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
During an IPsec VPN troubleshooting, you run 'diagnose vpn ike config' and see the output includes 'peer-id: any'. What does this mean?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The FortiGate will accept any peer identity during IKE authentication.
The peer-id field in the IKE config shows the expected identity of the remote peer. If it's 'any', the FortiGate will accept any peer ID during Phase 1 authentication, which is typically used when the remote peer's IP is dynamic or when using certificates with subject matching disabled.
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.
✗
The FortiGate will accept connections from any remote IP address.
Why it's wrong here
The peer-id is about identity, not IP address; IP is matched separately.
✗
The FortiGate will use aggressive mode for IKE negotiation.
Why it's wrong here
Aggressive mode is set separately; peer-id 'any' is not related to mode.
✗
The Phase 2 selectors are configured for any protocol.
Why it's wrong here
Phase 2 selectors are separate; peer-id is Phase 1.
✓
The FortiGate will accept any peer identity during IKE authentication.
Why this is correct
Peer-id 'any' means identity validation is not enforced.
Related concept
Read the scenario before looking for a memorised answer.
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: The FortiGate will accept any peer identity during IKE authentication. — The peer-id field in the IKE config shows the expected identity of the remote peer. If it's 'any', the FortiGate will accept any peer ID during Phase 1 authentication, which is typically used when the remote peer's IP is dynamic or when using certificates with subject matching disabled.
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.
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Question Discussion
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