The answer is that the on-premises router must be configured with the correct pre-shared key and tunnel IP addresses. This is because an AWS Site-to-Site VPN tunnel requires both endpoints to agree on the IKE authentication parameters and the virtual tunnel interface addresses; if the on-premises device lacks these matching values, the IPsec negotiation fails and the tunnel status remains down. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding that tunnel establishment is a Layer 3 connectivity issue separate from routing—route propagation or static routes only matter after the tunnel is up. A common trap is to assume the VPN connection’s configuration on the AWS side automatically pushes settings to the on-premises router, but it does not; you must manually apply the pre-shared key and tunnel IPs from the VPN connection’s downloaded configuration file. Memory tip: think of the pre-shared key as the “handshake” and the tunnel IPs as the “address”—without both, the tunnel cannot shake hands or find its destination.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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 network engineer is configuring an AWS Site-to-Site VPN connection between a VPC and an on-premises network. The engineer creates a customer gateway, VPN connection, and virtual private gateway. The VPN tunnel status shows 'down'. Which configuration step is most likely missing?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the on-premises router with the correct pre-shared key and tunnel IP addresses
Option C is correct because the on-premises router must have the correct tunnel interface configuration matching AWS parameters. Option A is wrong because route propagation is for dynamic routing, not tunnel establishment. Option B is wrong because the VPN connection includes the tunnel configuration. Option D is wrong because propagation is not required for tunnel status.
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.
✗
Attach the VPN connection to the virtual private gateway
Why it's wrong here
This is already done when creating the VPN connection.
✗
Enable route propagation on the virtual private gateway
Why it's wrong here
Route propagation is for routing, not tunnel establishment.
✗
Add a static route to the VPN connection in the route table
Why it's wrong here
Not required for tunnel status.
✓
Configure the on-premises router with the correct pre-shared key and tunnel IP addresses
Why this is correct
The on-premises device must have matching parameters.
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.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which ANS-C01 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.
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the on-premises router with the correct pre-shared key and tunnel IP addresses — Option C is correct because the on-premises router must have the correct tunnel interface configuration matching AWS parameters. Option A is wrong because route propagation is for dynamic routing, not tunnel establishment. Option B is wrong because the VPN connection includes the tunnel configuration. Option D is wrong because propagation is not required for tunnel status.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 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 →
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. A network engineer is setting up a site-to-site VPN connection between an on-premises network and AWS. After configuring the customer gateway, virtual private gateway, and VPN tunnel, the tunnel status shows 'DOWN'. Which step should the engineer take FIRST to troubleshoot?
easy
A.Verify that route propagation is enabled on the VPC route table
B.Enable detailed CloudWatch metrics on the VPN connection
C.Test connectivity by pinging an EC2 instance in the VPC
✓ D.Check the on-premises VPN device configuration for mismatched parameters
Why D: Option D is correct because the first step is to check the VPN configuration on the on-premises device to ensure it matches AWS settings. Option A is incorrect because CloudWatch metrics may not show tunnel status. Option B is incorrect because the VPN is down, so connectivity tests will fail. Option C is incorrect because checking route propagation is secondary.
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This ANS-C01 practice question is part of Courseiva's free Amazon Web Services 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 ANS-C01 exam.
Question Discussion
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