← SOA-C02·Amazon Web Services

Question 364 of 1,546

Security and Compliance →mediumMultiple ChoiceObjective-mapped

SOA-C02 Security and Compliance Practice Question

This SOA-C02 practice question tests your understanding of security and compliance. 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 company has a production AWS account with multiple IAM users. The security team wants to implement a policy that prevents users from launching EC2 instances without an IAM role that grants access to an S3 bucket containing sensitive data. The policy should also allow users to launch instances with other roles. A SysOps administrator creates an IAM policy that denies ec2:RunInstances if the instance does not have a specific IAM instance profile. However, users are still able to launch instances without any role. What is the most likely reason, and what should be done to fix it?

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.

A
The condition key 'ec2:InstanceProfileArn' is misspelled; it should be 'ec2:IamInstanceProfile'.
Why wrong: The correct key is actually ec2:IamInstanceProfile? No, it's ec2:InstanceProfileArn. The misspelling is not the issue.
B
The policy should be attached to the user's group instead of the user.
Why wrong: Attaching to group does not fix the condition key.
C
The policy needs to be applied as a service control policy (SCP) to be effective.
Why wrong: SCPs are for Organizations, not needed here.
D
The condition key is incorrect; the policy should use 'ec2:InstanceProfile' condition key with a specific ARN.
This option is correct because the condition key should be 'ec2:InstanceProfile', not 'ec2:InstanceProfileArn'. The 'ec2:InstanceProfileArn' condition key does not exist for EC2, so the policy never matches, and the deny effect does not apply, allowing users to launch instances without any role.

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 condition key is incorrect; the policy should use 'ec2:InstanceProfile' condition key with a specific ARN.

Option D is correct because the correct condition key for checking an instance's IAM role at launch is 'ec2:InstanceProfile', not 'ec2:InstanceProfileArn'. The 'ec2:InstanceProfile' condition key evaluates the ARN of the instance profile associated with the instance. Using 'ec2:InstanceProfileArn' is not a valid condition key for EC2, so the policy never matches, and the deny effect never applies, allowing users to launch instances without any role.

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 condition key 'ec2:InstanceProfileArn' is misspelled; it should be 'ec2:IamInstanceProfile'.
Why it's wrong here
The correct key is actually ec2:IamInstanceProfile? No, it's ec2:InstanceProfileArn. The misspelling is not the issue.
✗
The policy should be attached to the user's group instead of the user.
Why it's wrong here
Attaching to group does not fix the condition key.
✗
The policy needs to be applied as a service control policy (SCP) to be effective.
Why it's wrong here
SCPs are for Organizations, not needed here.
✓
The condition key is incorrect; the policy should use 'ec2:InstanceProfile' condition key with a specific ARN.
Why this is correct
This option is correct because the condition key should be 'ec2:InstanceProfile', not 'ec2:InstanceProfileArn'. The 'ec2:InstanceProfileArn' condition key does not exist for EC2, so the policy never matches, and the deny effect does not apply, allowing users to launch instances without any role.
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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume all AWS condition keys follow a consistent 'ResourceArn' naming pattern, but EC2 uses 'ec2:InstanceProfile' without the 'Arn' suffix, leading to a policy that silently fails to deny the action.

Detailed technical explanation

How to think about this question

The 'ec2:InstanceProfile' condition key evaluates the ARN of the instance profile (e.g., 'arn:aws:iam::123456789012:instance-profile/MyProfile'). When no IAM role is attached, the condition key is absent or evaluates to an empty string, so a deny with a specific ARN will not match. This is a common pitfall because many AWS services use 'Arn' suffix condition keys (e.g., 's3:prefix'), but EC2's instance profile condition key omits the 'Arn' suffix. In a real-world scenario, you would combine this condition with a 'Null' check to explicitly deny launches when no instance profile is specified.

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.

TExam Day Tips

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 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.

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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 — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The condition key is incorrect; the policy should use 'ec2:InstanceProfile' condition key with a specific ARN. — Option D is correct because the correct condition key for checking an instance's IAM role at launch is 'ec2:InstanceProfile', not 'ec2:InstanceProfileArn'. The 'ec2:InstanceProfile' condition key evaluates the ARN of the instance profile associated with the instance. Using 'ec2:InstanceProfileArn' is not a valid condition key for EC2, so the policy never matches, and the deny effect never applies, allowing users to launch instances without any role.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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