← SOA-C02·Amazon Web Services

Question 698 of 1,546

Security and Compliance →hardMultiple ChoiceObjective-mapped

IAM Condition Element for EC2 Tags — Troubleshooting Access

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 SysOps administrator must grant an IAM user the ability to start and stop specific EC2 instances, but NOT terminate them. The administrator creates a policy with the following statement. However, the user can still terminate instances. 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: "NOT"
Why it matters: Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
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.

A
The policy does not restrict the ec2:TerminateInstances action to specific instances using a condition or ARN
The policy allows ec2:TerminateInstances on all instances if the condition is not met, because the condition is only applied if the tag exists; if the tag does not exist, the Allow applies unconditionally.
B
The condition key ec2:ResourceTag is not a valid condition key for EC2 actions
Why wrong: ec2:ResourceTag is a valid condition key.
C
The ec2:TerminateInstances action is not allowed in a customer-managed policy
Why wrong: ec2:TerminateInstances can be allowed in customer-managed policies.
D
The policy does not include an explicit deny for ec2:TerminateInstances
Why wrong: Explicit deny is not required; an allow with a condition should restrict, but the policy structure is flawed.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The policy does not restrict the ec2:TerminateInstances action to specific instances using a condition or ARN

Option A is correct because EC2 actions like StopInstances and StartInstances require a resource-level permission on the instance, but TerminateInstances also requires a resource-level permission. The policy includes ec2:TerminateInstances with a condition, but if the condition is not met, the effect is Allow (since the condition is not satisfied, the statement might still allow termination if the condition is ignored). However, the key issue is that the policy uses ec2:ResourceTag as a condition key, which is valid, but the condition uses StringEquals, which requires the instance to have that tag. If the instance does not have the tag, the condition fails and the Allow does not apply, but there might be an implicit deny? Actually, the policy grants ec2:TerminateInstances with a condition that might not match, so the action is not allowed. But the user can still terminate, meaning the policy is too permissive. The most likely reason is that the policy allows ec2:TerminateInstances without proper resource restriction. Option B is incorrect because the condition key is correct. Option C is incorrect because termination is explicitly allowed with a condition. Option D is incorrect because the policy explicitly allows StartInstances and StopInstances.

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.

✓
The policy does not restrict the ec2:TerminateInstances action to specific instances using a condition or ARN
Why this is correct
The policy allows ec2:TerminateInstances on all instances if the condition is not met, because the condition is only applied if the tag exists; if the tag does not exist, the Allow applies unconditionally.
Clue confirmation
The clue words "NOT", "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The condition key ec2:ResourceTag is not a valid condition key for EC2 actions
Why it's wrong here
ec2:ResourceTag is a valid condition key.
✗
The ec2:TerminateInstances action is not allowed in a customer-managed policy
Why it's wrong here
ec2:TerminateInstances can be allowed in customer-managed policies.
✗
The policy does not include an explicit deny for ec2:TerminateInstances
Why it's wrong here
Explicit deny is not required; an allow with a condition should restrict, but the policy structure is flawed.

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 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 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.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

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: The policy does not restrict the ec2:TerminateInstances action to specific instances using a condition or ARN — Option A is correct because EC2 actions like StopInstances and StartInstances require a resource-level permission on the instance, but TerminateInstances also requires a resource-level permission. The policy includes ec2:TerminateInstances with a condition, but if the condition is not met, the effect is Allow (since the condition is not satisfied, the statement might still allow termination if the condition is ignored). However, the key issue is that the policy uses ec2:ResourceTag as a condition key, which is valid, but the condition uses StringEquals, which requires the instance to have that tag. If the instance does not have the tag, the condition fails and the Allow does not apply, but there might be an implicit deny? Actually, the policy grants ec2:TerminateInstances with a condition that might not match, so the action is not allowed. But the user can still terminate, meaning the policy is too permissive. The most likely reason is that the policy allows ec2:TerminateInstances without proper resource restriction. Option B is incorrect because the condition key is correct. Option C is incorrect because termination is explicitly allowed with a condition. Option D is incorrect because the policy explicitly allows StartInstances and StopInstances.

What should I do if I get this SOA-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "NOT", "most likely". Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.

What is the key concept behind this question?

Standard ACLs match source addresses.

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Same concept, more angles

1 more ways this is tested on SOA-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. An administrator needs to grant an IAM user the ability to stop and start EC2 instances, but only for instances tagged with 'Environment:Production'. Which IAM policy element should be used to enforce this condition?

easy

A.Effect
B.Resource
C.Action
✓ D.Condition

Why D: Option D is correct because the Condition element in an IAM policy allows specifying conditions, such as restricting actions to instances with a specific tag (e.g., 'Environment:Production'). Option A is incorrect because Effect determines whether the policy allows or denies access. Option B is incorrect because Resource specifies the ARN of the resources the policy applies to. Option C is incorrect because Action specifies the specific operations (e.g., ec2:StopInstances) that are allowed or denied.

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