The correct answer is to add a condition in the IAM role’s trust policy that checks for the instance tag using the `aws:ResourceTag` condition key. This works because the trust policy defines who can assume the role, and by including a condition like `"StringEquals": {"aws:ResourceTag/Environment": "Production"}`, you restrict role assumption solely to EC2 instances bearing that specific tag. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of IAM trust policies versus identity-based policies—a common trap is assuming tags are automatically inherited by the session, but they must be explicitly evaluated in the trust policy. Remember that SCPs apply at the account level, not to individual instances, and instance profiles themselves cannot enforce tag checks. A helpful memory tip: “Trust policies tag-check the resource, not the requester”—the condition key `aws:ResourceTag` evaluates the EC2 instance’s tags, not the user’s.
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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.
A company uses IAM roles to grant EC2 instances access to S3 buckets. After a recent security audit, the SysOps administrator must ensure that only instances with a specific tag (Environment=Production) can assume the role. How can this be achieved?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a condition in the role's trust policy that checks for the instance's tag using the aws:ResourceTag condition key.
Option D is correct because IAM role trust policies can use the aws:ResourceTag condition key to restrict which EC2 instances (based on their tags) can assume the role. Option A is wrong because tags are not automatically included in the session; the trust policy must explicitly check tags. Option B is wrong because SCPs apply to accounts, not instances. Option C is wrong because instance profiles cannot be modified to check tags.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create a new IAM role for each instance and attach the tag.
Why it's wrong here
This is not scalable and does not enforce the tag requirement.
✗
Use a service control policy (SCP) to deny the ec2:AssumeRole action for instances without the required tag.
Why it's wrong here
SCPs apply to accounts, not to EC2 instances.
✗
Modify the instance profile to include the tag requirement.
Why it's wrong here
Instance profiles do not support tag-based conditions.
✓
Add a condition in the role's trust policy that checks for the instance's tag using the aws:ResourceTag condition key.
Why this is correct
The trust policy can evaluate the instance's tags at the time of AssumeRole.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SOA-C02 ACL questions on filtering logic and placement.
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Add a condition in the role's trust policy that checks for the instance's tag using the aws:ResourceTag condition key. — Option D is correct because IAM role trust policies can use the aws:ResourceTag condition key to restrict which EC2 instances (based on their tags) can assume the role. Option A is wrong because tags are not automatically included in the session; the trust policy must explicitly check tags. Option B is wrong because SCPs apply to accounts, not instances. Option C is wrong because instance profiles cannot be modified to check tags.
What should I do if I get this SOA-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SOA-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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