- A
The consumer's route table routes traffic to the endpoint via the NAT gateway
Why wrong: Incorrect. Traffic to a VPC endpoint is destined to private IP addresses of endpoint ENIs, not to the NAT gateway. The route table should have a route to the endpoint, not via the NAT gateway.
- B
The VPC endpoint service is not available in the consumer's Availability Zone
Why wrong: Incorrect. Since DNS resolution works, the endpoint service is available in the consumer's AZ. DNS resolution would fail if the endpoint service were not available in the AZ.
- C
The VPC endpoint security group does not allow inbound HTTPS from the consumer's EC2 instances
Why wrong: Incorrect. The stem explicitly states that the security group allows inbound HTTPS from the consumer's VPC CIDR, so this is not the cause of the connection failure.
- D
The consumer's route table does not have a route to the VPC endpoint
Correct. The consumer's route table must contain a route that points traffic destined to the endpoint's service (or the endpoint's CIDR) to the VPC endpoint's ENI. Without this route, traffic may be dropped or misrouted, preventing connectivity despite successful DNS resolution.
ANS-C01 AWS PrivateLink Practice Question
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. A key principle to apply: aWS PrivateLink. 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 PrivateLink to access a SaaS application hosted in another AWS account. The SaaS provider has created a VPC endpoint service in their account. The consumer has created a VPC endpoint in their VPC. The consumer's VPC has a route table with a local route and a route to a NAT gateway. The VPC endpoint is associated with a security group that allows inbound HTTPS from the consumer's VPC CIDR. The consumer's EC2 instances can resolve the DNS name of the endpoint but cannot connect to the SaaS service. 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 consumer's route table does not have a route to the VPC endpoint
For PrivateLink, the consumer's VPC endpoint is accessed via private IP addresses from the endpoint's elastic network interfaces (ENIs) in the consumer's VPC. The consumer's VPC route table must have a route to the endpoint's ENI to direct traffic correctly. The stem states that the security group allows inbound HTTPS from the consumer's VPC CIDR, so option C is not the cause. DNS resolution works because the endpoint's DNS name resolves to the private IPs of the ENIs, but without a matching route in the route table, traffic may be dropped or misrouted. Option D is the most likely cause.
Key principle: AWS PrivateLink
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 consumer's route table routes traffic to the endpoint via the NAT gateway
- ✗
The VPC endpoint service is not available in the consumer's Availability Zone
Why it's wrong here
Incorrect. Since DNS resolution works, the endpoint service is available in the consumer's AZ. DNS resolution would fail if the endpoint service were not available in the AZ.
- ✗
The VPC endpoint security group does not allow inbound HTTPS from the consumer's EC2 instances
- ✓
The consumer's route table does not have a route to the VPC endpoint
Why this is correct
Correct. The consumer's route table must contain a route that points traffic destined to the endpoint's service (or the endpoint's CIDR) to the VPC endpoint's ENI. Without this route, traffic may be dropped or misrouted, preventing connectivity despite successful DNS resolution.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
AWS PrivateLink
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake is to assume that if DNS resolution works, routing is fine. However, DNS resolves to private IPs, but the route table must have a route directing traffic to the VPC endpoint's ENI. Without that route, traffic may go to the NAT gateway (if present) or be dropped.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- AWS PrivateLink
- VPC Endpoint
- Route Table
- Security Group
TExam Day Tips
- 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
AWS PrivateLink
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review aWS PrivateLink, then practise related ANS-C01 questions on the same topic to reinforce the concept.
- →
Network Implementation — study guide chapter
Learn the concepts, then practise the questions
- →
Network Implementation practice questions
Targeted practice on this topic area only
- →
All ANS-C01 questions
1,705 questions across all exam domains
- →
AWS Certified Advanced Networking Specialty ANS-C01 study guide
Full concept coverage aligned to exam objectives
- →
ANS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related ANS-C01 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Network Management and Operations practice questions
Practise ANS-C01 questions linked to Network Management and Operations.
Network Security, Compliance and Governance practice questions
Practise ANS-C01 questions linked to Network Security, Compliance and Governance.
Network Design practice questions
Practise ANS-C01 questions linked to Network Design.
Network Implementation practice questions
Practise ANS-C01 questions linked to Network Implementation.
ANS-C01 fundamentals practice questions
Practise ANS-C01 questions linked to ANS-C01 fundamentals.
ANS-C01 scenario practice questions
Practise ANS-C01 questions linked to ANS-C01 scenario.
ANS-C01 troubleshooting practice questions
Practise ANS-C01 questions linked to ANS-C01 troubleshooting.
Practice this exam
Start a free ANS-C01 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — AWS PrivateLink.
What is the correct answer to this question?
The correct answer is: The consumer's route table does not have a route to the VPC endpoint — For PrivateLink, the consumer's VPC endpoint is accessed via private IP addresses from the endpoint's elastic network interfaces (ENIs) in the consumer's VPC. The consumer's VPC route table must have a route to the endpoint's ENI to direct traffic correctly. The stem states that the security group allows inbound HTTPS from the consumer's VPC CIDR, so option C is not the cause. DNS resolution works because the endpoint's DNS name resolves to the private IPs of the ENIs, but without a matching route in the route table, traffic may be dropped or misrouted. Option D is the most likely cause.
What should I do if I get this ANS-C01 question wrong?
Review aWS PrivateLink, then practise related ANS-C01 questions on the same topic to reinforce the concept.
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?
AWS PrivateLink
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 →
Keep practising
More ANS-C01 practice questions
- A financial services company has a VPC with a public subnet and a private subnet. EC2 instances in the private subnet ne…
- A company is designing a network security architecture for a multi-account environment using AWS Transit Gateway. The se…
- A company is using AWS Direct Connect to connect its on-premises network to AWS. The company wants to encrypt all traffi…
- A company uses AWS Transit Gateway to connect multiple VPCs and on-premises networks via AWS Site-to-Site VPN. The secur…
- A company runs a web application on EC2 instances behind an Application Load Balancer (ALB). The application must be acc…
- A global e-commerce company uses a hub-and-spoke network topology with a transit VPC in us-east-1. Each spoke VPC has an…
Last reviewed: Jun 20, 2026
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.