This ANS-C01 practice question tests your understanding of network design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An administrator needs to create an interface VPC endpoint for Amazon S3 in a VPC and attach an elastic network interface (ENI) to an EC2 instance. The administrator applies the IAM policy shown in the exhibit. Which action will be DENIED by this policy?
Why wrong: The policy allows ec2:AttachNetworkInterface with Resource "*", so this action is permitted.
B
Create the VPC endpoint
Why wrong: The policy allows ec2:CreateVpcEndpoint, but the Resource "*" is not sufficient; the action requires the resource to specify the VPC endpoint service ARN. Therefore, this action will be denied.
C
Describe VPC endpoints
Why wrong: The policy allows ec2:DescribeVpcEndpoints with Resource "*", so this action is permitted.
D
Modify the VPC endpoint
Why wrong: The policy allows ec2:ModifyVpcEndpoint with Resource "*", so this action is permitted.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The IAM policy allows ec2:CreateVpcEndpoint, but the Resource is set to "*" which does not satisfy the resource requirement for this action. The ec2:CreateVpcEndpoint action requires the resource to be the VPC endpoint service (e.g., arn:aws:ec2:region:account-id:vpc-endpoint-service/*). Without a specific resource ARN, the policy does not grant permission to create the endpoint, so the action will be denied. In contrast, ec2:AttachNetworkInterface, ec2:DescribeVpcEndpoints, and ec2:ModifyVpcEndpoint are allowed by the policy with the wildcard resource.
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 ENI to the EC2 instance
Why it's wrong here
The policy allows ec2:AttachNetworkInterface with Resource "*", so this action is permitted.
✗
Create the VPC endpoint
Why it's wrong here
The policy allows ec2:CreateVpcEndpoint, but the Resource "*" is not sufficient; the action requires the resource to specify the VPC endpoint service ARN. Therefore, this action will be denied.
✗
Describe VPC endpoints
Why it's wrong here
The policy allows ec2:DescribeVpcEndpoints with Resource "*", so this action is permitted.
✗
Modify the VPC endpoint
Why it's wrong here
The policy allows ec2:ModifyVpcEndpoint with Resource "*", so this action is permitted.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
Storage Class
Min Duration
Retrieval
Use Case
S3 Standard
None
Immediate
Frequently accessed data
S3 Standard-IA
30 days
Immediate
Infrequent access, rapid retrieval
S3 One Zone-IA
30 days
Immediate
Non-critical infrequent data
S3 Intelligent-Tiering
None
Immediate–hours
Unknown or changing access patterns
S3 Glacier Instant
90 days
Milliseconds
Archive with instant retrieval
S3 Glacier Flexible
90 days
Minutes–hours
Archive, flexible retrieval
S3 Glacier Deep Archive
180 days
Hours
Long-term compliance archive
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 Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What exam trap should I watch out for?
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.
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.
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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