The answer is that the PrivateDnsEnabled flag is set to false on the VPC endpoint. When this flag is false, AWS does not automatically create a Route 53 private hosted zone for the endpoint, which means the private DNS name for the service never resolves, even though the endpoint itself shows as available. This is a core concept for VPC endpoint private DNS resolution: the flag must be true for AWS to manage the DNS records that map the service’s private DNS name to the endpoint’s network interfaces. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how VPC endpoints interact with Route 53, often appearing as a trick where candidates assume the endpoint’s status alone guarantees connectivity. A common trap is confusing this with endpoint policies or security groups, but the absence of a DNS record directly points to the PrivateDnsEnabled setting. Memory tip: think “DNS needs the flag—no flag, no record.”
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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.
Network Topology
A network engineer has created a VPC endpoint for a VPC endpoint service. The endpoint is 'available' but the application cannot connect to the service using the private DNS name. The engineer checks the Route 53 private hosted zone and finds that no record exists for the endpoint. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'PrivateDnsEnabled' flag is set to false on the VPC endpoint
When 'VpcEndpointPolicyEnabled' is true, the endpoint has a policy that may restrict access. However, the issue is that the private DNS name is not resolving. For VPC endpoints, AWS automatically creates a Route 53 private hosted zone for the endpoint if 'PrivateDnsEnabled' is true. If it's false, no automatic DNS record is created. Option C is correct. Options A, B, and D are plausible but not the most likely given the lack of DNS record.
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 VPC endpoint service is not accepting connections
Why it's wrong here
The endpoint is in 'available' state, so the service is accepting.
✗
The VPC endpoint policy is blocking connectivity
Why it's wrong here
Policy would affect access after DNS resolution, not DNS resolution itself.
✗
The security group for the endpoint does not allow inbound traffic
Why it's wrong here
Security groups affect traffic, not DNS resolution.
✓
The 'PrivateDnsEnabled' flag is set to false on the VPC endpoint
Why this is correct
If private DNS is not enabled, Route 53 does not automatically create records for the endpoint.
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 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 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: The 'PrivateDnsEnabled' flag is set to false on the VPC endpoint — When 'VpcEndpointPolicyEnabled' is true, the endpoint has a policy that may restrict access. However, the issue is that the private DNS name is not resolving. For VPC endpoints, AWS automatically creates a Route 53 private hosted zone for the endpoint if 'PrivateDnsEnabled' is true. If it's false, no automatic DNS record is created. Option C is correct. Options A, B, and D are plausible but not the most likely given the lack of DNS record.
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.
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Question Discussion
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