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Question 494 of 1,546

Reliability and Business Continuity →mediumMultiple ChoiceObjective-mapped

SOA-C02 Reliability and Business Continuity Practice Question

This SOA-C02 practice question tests your understanding of reliability and business continuity. 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 has a production AWS account with multiple IAM users. The SysOps administrator needs to ensure that all IAM users have multi-factor authentication (MFA) enabled for console access. If a user does not have MFA enabled, they should be denied access to all AWS services except for the ability to enable MFA on their own account. The administrator has created an IAM policy that denies all actions if MFA is not present, but the policy is not working as expected; users without MFA can still access the S3 console. The administrator attaches the policy to all users. What is the most likely reason the policy is not effective?

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 policy includes an Allow statement that grants access to all services, which overrides the Deny statement.
Why wrong: Option A is wrong because the policy needs to explicitly deny actions when MFA is not present; an Allow statement would not restrict.
B
The policy's condition is not properly configured to check for MFA. The condition should use 'aws:MultiFactorAuthPresent' with a value of 'false'.
Option B is correct because for the Deny effect to work, the condition must check for the presence of MFA. The condition key 'aws:MultiFactorAuthPresent' should be set to 'false' to deny access.
C
The policy uses the condition key 'aws:MFAPresent' instead of 'aws:MultiFactorAuthPresent'.
Why wrong: Option C is wrong because the condition key should be 'aws:MultiFactorAuthPresent' not 'aws:MFAPresent'.
D
The policy is attached to an IAM group, but the users are not members of that group.
Why wrong: Option D is wrong because the policy is attached to an IAM group, but the users are not members of that group, so the policy does not apply to them.

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's condition is not properly configured to check for MFA. The condition should use 'aws:MultiFactorAuthPresent' with a value of 'false'.

Option B is correct because for the Deny effect to work, the condition must check for the presence of MFA. The condition key 'aws:MultiFactorAuthPresent' should be set to 'false' to deny access when MFA is not present. Option A is wrong because an Allow statement would not override a Deny; the issue is with the condition, not an Allow statement. Option C is wrong because the condition key should be 'aws:MultiFactorAuthPresent', not 'aws:MFAPresent'. Option D is wrong because the policy is attached directly to all users, so group membership is not relevant.

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 includes an Allow statement that grants access to all services, which overrides the Deny statement.
Why it's wrong here
Option A is wrong because the policy needs to explicitly deny actions when MFA is not present; an Allow statement would not restrict.
✓
The policy's condition is not properly configured to check for MFA. The condition should use 'aws:MultiFactorAuthPresent' with a value of 'false'.
Why this is correct
Option B is correct because for the Deny effect to work, the condition must check for the presence of MFA. The condition key 'aws:MultiFactorAuthPresent' should be set to 'false' to deny access.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The policy uses the condition key 'aws:MFAPresent' instead of 'aws:MultiFactorAuthPresent'.
Why it's wrong here
Option C is wrong because the condition key should be 'aws:MultiFactorAuthPresent' not 'aws:MFAPresent'.
✗
The policy is attached to an IAM group, but the users are not members of that group.
Why it's wrong here
Option D is wrong because the policy is attached to an IAM group, but the users are not members of that group, so the policy does not apply to them.

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.

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.

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?

Reliability and Business Continuity — This question tests Reliability and Business Continuity — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The policy's condition is not properly configured to check for MFA. The condition should use 'aws:MultiFactorAuthPresent' with a value of 'false'. — Option B is correct because for the Deny effect to work, the condition must check for the presence of MFA. The condition key 'aws:MultiFactorAuthPresent' should be set to 'false' to deny access when MFA is not present. Option A is wrong because an Allow statement would not override a Deny; the issue is with the condition, not an Allow statement. Option C is wrong because the condition key should be 'aws:MultiFactorAuthPresent', not 'aws:MFAPresent'. Option D is wrong because the policy is attached directly to all users, so group membership is not relevant.

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: "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?

Standard ACLs match source addresses.

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