The answer is that aggressive mode transmits the identification in clear text, making it the correct choice when evaluating IKEv1 security weaknesses. This is because during IKEv1 Phase 1 aggressive mode, the identity payload—such as the peer’s IP address or FQDN—is sent unencrypted before the secure tunnel is established, while the pre-shared key is only hashed, not encrypted. On the Fortinet NSE 4 Network Security Professional exam, this concept tests your understanding of how aggressive mode prioritizes speed over confidentiality, often appearing in troubleshooting scenarios where a VPN establishes but exposes peer identities. A common trap is assuming the pre-shared key is the main vulnerability, but the real risk is identity exposure, which can be exploited for man-in-the-middle attacks. Remember the memory tip: “Aggressive mode is fast but flashy—it shows your ID before the door is locked.”
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.
An administrator is troubleshooting an IPsec VPN that uses aggressive mode. The VPN establishes successfully, but the administrator is concerned about security. Which statement is true regarding aggressive mode?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Aggressive mode transmits the identification in clear text
In IKEv1 aggressive mode, the pre-shared key is transmitted in a hashed form but the identity is sent in clear text during Phase1. This makes it less secure than main mode, which protects the identity.
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.
✗
Aggressive mode is more secure than main mode
Why it's wrong here
Main mode is more secure because it encrypts the identity.
✓
Aggressive mode transmits the identification in clear text
Why this is correct
The identity (ID) is not encrypted, making it vulnerable to eavesdropping.
Related concept
Read the scenario before looking for a memorised answer.
✗
Aggressive mode provides perfect forward secrecy (PFS) by default
Why it's wrong here
PFS is configured separately in Phase2.
✗
Aggressive mode uses six messages instead of three
Why it's wrong here
Aggressive mode uses three messages; main mode uses six.
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: Aggressive mode transmits the identification in clear text — In IKEv1 aggressive mode, the pre-shared key is transmitted in a hashed form but the identity is sent in clear text during Phase1. This makes it less secure than main mode, which protects the identity.
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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