This ANS-C01 practice question tests your understanding of network implementation. 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 company uses AWS Direct Connect with a private VIF to connect to a VPC. They have an on-premises application that needs to resolve private hosted zone names in Amazon Route 53. The on-premises DNS server forwards queries for the private domain to the VPC's DNS resolver. However, resolution fails. 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
✓
A Route 53 Resolver outbound endpoint is not configured to forward queries from on-premises to the VPC.
Option D is correct because the Route 53 Resolver outbound endpoint is required to forward DNS queries from on-premises to the Route 53 private hosted zones. Without it, the VPC resolver does not accept queries from external sources. Option A is wrong because the private hosted zone is associated with the VPC. Option B is wrong because the VPC's DHCP option set typically uses the default VPC resolver (or custom), but the issue is inbound queries. Option C is wrong because security groups apply to instances, not to the VPC DNS resolver.
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 private hosted zone is not associated with the VPC.
Why it's wrong here
If it's associated, resolution from within the VPC works; the issue is incoming queries from on-premises.
✗
The VPC's DHCP option set is not configured to use the Route 53 Resolver.
Why it's wrong here
DHCP option set affects instances within the VPC, not external DNS forwarding.
✗
The security group for the VPC DNS resolver is blocking inbound UDP port 53 from the on-premises network.
Why it's wrong here
There is no security group for the VPC DNS resolver; it is a managed service.
✓
A Route 53 Resolver outbound endpoint is not configured to forward queries from on-premises to the VPC.
Why this is correct
An outbound endpoint allows on-premises to forward DNS queries to Route 53 Resolver.
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 Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Route 53 Resolver outbound endpoint is not configured to forward queries from on-premises to the VPC. — Option D is correct because the Route 53 Resolver outbound endpoint is required to forward DNS queries from on-premises to the Route 53 private hosted zones. Without it, the VPC resolver does not accept queries from external sources. Option A is wrong because the private hosted zone is associated with the VPC. Option B is wrong because the VPC's DHCP option set typically uses the default VPC resolver (or custom), but the issue is inbound queries. Option C is wrong because security groups apply to instances, not to the VPC DNS resolver.
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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