The answer is that the API call will be denied with an authorization error. This occurs because the IAM policy explicitly allows VPC and subnet creation and deletion only in us-east-1 by using a region condition, such as `aws:RequestedRegion`, which restricts the action to that single Region. When the user attempts to create a VPC in eu-west-1, the condition key evaluates the target Region against the policy, and since it does not match, AWS Identity and Access Management denies the request before any resource is created. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how IAM region conditions enforce resource-level boundaries, often appearing in questions about cross-Region access control or multi-account architectures. A common trap is assuming that an explicit allow without a condition grants global access, but the condition here overrides the allow for any other Region. Memory tip: think of the condition as a bouncer at a club—your VIP pass (allow) only works at the specific door (us-east-1), not at any other entrance.
ANS-C01 Network Design Practice Question
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 IAM policy attached to a user allows creating and deleting VPCs and subnets only in us-east-1. The user attempts to create a VPC in eu-west-1. What will happen?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The API call will be denied with an authorization error.
Option C is correct. The condition restricts actions to us-east-1 only, so the API call in eu-west-1 will be denied. Option A is wrong because the policy explicitly allows with a region condition. Option B is wrong because the condition is evaluated. Option D is wrong because no override exists.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 API call will be denied with an authorization error.
Why this is correct
The condition fails, so IAM denies the action.
Related concept
Authentication checks who the user is.
✗
The VPC will be created but the user will receive a warning.
Why it's wrong here
IAM denies if condition not met; no warning.
✗
The user can create the VPC because the condition is not applicable to VPC creation.
Why it's wrong here
The condition applies to all actions in the statement.
✗
The VPC will be created successfully because the policy allows ec2:CreateVpc.
Why it's wrong here
The condition restricts to us-east-1, so creation in eu-west-1 is denied.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related ANS-C01 questions on access control and AAA configuration.
Network Design — This question tests Network Design — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The API call will be denied with an authorization error. — Option C is correct. The condition restricts actions to us-east-1 only, so the API call in eu-west-1 will be denied. Option A is wrong because the policy explicitly allows with a region condition. Option B is wrong because the condition is evaluated. Option D is wrong because no override exists.
What should I do if I get this ANS-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related ANS-C01 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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