- A
The pre-shared keys on both ends do not match.
Why wrong: Mismatched PSKs cause a different error like 'invalid IKE SA authentication payload'.
- B
The authentication method is set to 'pre-shared key' on one side and 'certificate' on the other.
This mismatch directly causes the 'IKE SA negotiation failed due to mismatched authentication method' error.
- C
The VPN gateway is using the wrong external IP address.
Why wrong: Incorrect IP addresses would cause a timeout or no response, not this specific error.
- D
The IKE version configured on the on-premises device is IKEv1 while Cloud VPN only supports IKEv2.
Why wrong: Cloud VPN supports IKEv1 and IKEv2, so version mismatch would not cause this specific error.
Question 413 of 1,000
PCNE Implementing Hybrid Interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. 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.
A network engineer is troubleshooting a Cloud VPN gateway that is not establishing a VPN tunnel with an on-premises device. The engineer checks the Cloud VPN gateway logs and sees the error 'IKE SA negotiation failed due to mismatched authentication method'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
The authentication method is set to 'pre-shared key' on one side and 'certificate' on the other.
The error indicates a mismatch between the authentication methods configured on both ends, such as pre-shared key vs certificate, or different authentication types.
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 pre-shared keys on both ends do not match.
Why it's wrong here
Mismatched PSKs cause a different error like 'invalid IKE SA authentication payload'.
- ✓
The authentication method is set to 'pre-shared key' on one side and 'certificate' on the other.
Why this is correct
This mismatch directly causes the 'IKE SA negotiation failed due to mismatched authentication method' error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The VPN gateway is using the wrong external IP address.
Why it's wrong here
Incorrect IP addresses would cause a timeout or no response, not this specific error.
- ✗
The IKE version configured on the on-premises device is IKEv1 while Cloud VPN only supports IKEv2.
Why it's wrong here
Cloud VPN supports IKEv1 and IKEv2, so version mismatch would not cause this specific error.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which PCNE 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.
- →
Implementing Hybrid Interconnectivity — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Implementing Hybrid Interconnectivity — This question tests Implementing Hybrid Interconnectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The authentication method is set to 'pre-shared key' on one side and 'certificate' on the other. — The error indicates a mismatch between the authentication methods configured on both ends, such as pre-shared key vs certificate, or different authentication types.
What should I do if I get this PCNE question wrong?
Identify which PCNE 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 →
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Last reviewed: Jul 4, 2026
This PCNE practice question is part of Courseiva's free Google Cloud 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 PCNE exam.
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