The answer is a missing `--region` parameter in the AWS CLI command. This is correct because the `aws:RequestedRegion` condition key evaluates the regional endpoint to which the API call is directed, not the physical location of the resources. When a user omits the `--region` parameter, the CLI defaults to a global endpoint (or a region defined in the config file that differs from `us-east-1`), causing the `ec2:RunInstances` request to fail with an `UnauthorizedOperation` error even though the user is launching instances in `us-east-1`. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how IAM condition keys interact with API endpoints—a common trap is assuming the condition checks the resource’s region rather than the request’s destination. Remember the memory tip: “Region in the request, not the resource—check the endpoint, not the instance.”
SCS-C02 Infrastructure Security Practice Question
This SCS-C02 practice question tests your understanding of infrastructure security. 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.
A security engineer is reviewing AWS CloudTrail logs and notices repeated `UnauthorizedOperation` errors for `ec2:RunInstances` from a specific IAM user. The user has a policy that allows `ec2:RunInstances` with a condition `aws:RequestedRegion` set to `us-east-1`. The engineer confirms the user is launching instances in `us-east-1`. What is the most likely cause of the error?
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 user is using an AWS CLI command that does not include the `--region` parameter, causing the request to go to a global endpoint.
Option B is correct because the condition key `aws:RequestedRegion` checks the region endpoint used, but if the user is using a global endpoint or the request includes a different region parameter, it may fail. Option A is wrong because even if the instance type is not supported, the error would be different. Option C is wrong because service-linked roles do not affect RunInstances authorization. Option D is wrong because the user already has a policy; an additional policy is not needed.
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 user does not have a service-linked role for EC2.
Why it's wrong here
Service-linked roles are not required for launching instances.
✗
The IAM policy lacks a `Resource` element specifying which instances can be launched.
Why it's wrong here
The policy can use `*` for resource; the error is due to region condition.
✗
The user is trying to launch an instance type that is not supported in us-east-1.
Why it's wrong here
This would result in an unsupported instance type error, not UnauthorizedOperation.
✓
The user is using an AWS CLI command that does not include the `--region` parameter, causing the request to go to a global endpoint.
Why this is correct
The condition key checks the requested region; without specifying region, it may default to a global endpoint.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
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 SCS-C02 questions on access control and AAA configuration.
Infrastructure Security — This question tests Infrastructure Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The user is using an AWS CLI command that does not include the `--region` parameter, causing the request to go to a global endpoint. — Option B is correct because the condition key `aws:RequestedRegion` checks the region endpoint used, but if the user is using a global endpoint or the request includes a different region parameter, it may fail. Option A is wrong because even if the instance type is not supported, the error would be different. Option C is wrong because service-linked roles do not affect RunInstances authorization. Option D is wrong because the user already has a policy; an additional policy is not needed.
What should I do if I get this SCS-C02 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 SCS-C02 questions on access control and AAA configuration.
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?
Authentication checks who the user is.
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