The answer is that the IAM policy denies ec2:Describe* actions when the region is not us-east-1, most likely using a condition with StringNotEquals on aws:RequestedRegion. This is the core of IAM policy region restriction: the condition block explicitly checks the requested region, and if it does not match us-east-1, the action is denied. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of how global versus regional services interact with IAM conditions, and it often appears in scenarios where a user can run commands in one region but not another. A common trap is confusing StringNotEquals with StringEquals—remember that StringNotEquals denies everything except the specified value, while StringEquals allows only that value. For a quick memory tip, think of StringNotEquals as a “block everything else” gate: if the region isn’t the one listed, the action is stopped.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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.
An IAM policy is applied to a user. The user reports that they cannot run 'aws ec2 describe-instances --region eu-west-1' but can run the same command in us-east-1. What is the most likely reason?
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 policy denies ec2:Describe* when the region is not us-east-1.
Option C is correct because the condition 'StringNotEquals' with 'aws:RequestedRegion' denies the action if the region is not us-east-1. Option A is wrong because the policy explicitly denies ec2:Describe* actions. Option B is wrong because the condition is StringNotEquals, not StringEquals. Option D is wrong because the policy does not specify resource-level conditions.
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 policy only applies to resources in us-east-1, so other regions are implicitly denied.
Why it's wrong here
The policy explicitly denies based on region, not resource location.
✗
The policy condition uses StringEquals, which only allows requests from us-east-1.
Why it's wrong here
The condition uses StringNotEquals, which denies non-us-east-1 requests.
✓
The policy denies ec2:Describe* when the region is not us-east-1.
Why this is correct
The condition denies requests to regions other than us-east-1.
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.
✗
The policy allows ec2:Describe* in all regions, but the user lacks permissions in eu-west-1.
Why it's wrong here
The policy denies ec2:Describe* when region is not us-east-1.
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 Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The policy denies ec2:Describe* when the region is not us-east-1. — Option C is correct because the condition 'StringNotEquals' with 'aws:RequestedRegion' denies the action if the region is not us-east-1. Option A is wrong because the policy explicitly denies ec2:Describe* actions. Option B is wrong because the condition is StringNotEquals, not StringEquals. Option D is wrong because the policy does not specify resource-level conditions.
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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