SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. 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.
Refer to the exhibit. A SysOps administrator creates an IAM policy to allow an EC2 instance to upload objects to an S3 bucket. However, the instance is unable to upload objects. 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: "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 IAM role is not attached to the EC2 instance.
The IAM role must be attached to the EC2 instance as an instance profile for the instance to assume the role and obtain temporary credentials. Without this attachment, the instance has no valid AWS credentials to sign API requests, so the s3:PutObject action will fail regardless of the permissions defined in the role's policy.
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 S3 bucket has server-side encryption enabled.
Why it's wrong here
Encryption does not prevent uploads.
✗
The policy does not include s3:GetObject permission.
Why it's wrong here
GetObject is not needed for uploads.
✗
The bucket policy denies all access.
Why it's wrong here
No bucket policy is shown; it may not exist.
✓
The IAM role is not attached to the EC2 instance.
Why this is correct
Without the role, the instance cannot assume permissions.
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 often assume the IAM policy alone is sufficient, forgetting that the EC2 instance must have a mechanism (the instance profile) to assume the role and obtain credentials.
Trap categories for this question
Command / output trap
No bucket policy is shown; it may not exist.
Detailed technical explanation
How to think about this question
When an IAM role is attached to an EC2 instance via an instance profile, the AWS credentials service (e.g., the EC2 metadata service at 169.254.169.254) provides temporary security credentials (access key, secret key, and session token) to the instance. Without this attachment, the instance cannot authenticate to AWS STS, so any SDK or CLI call will fail with an 'Access Denied' or 'Credentials missing' error, even if the role's policy is correctly configured.
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.
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IAM role is not attached to the EC2 instance. — The IAM role must be attached to the EC2 instance as an instance profile for the instance to assume the role and obtain temporary credentials. Without this attachment, the instance has no valid AWS credentials to sign API requests, so the s3:PutObject action will fail regardless of the permissions defined in the role's policy.
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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Question Discussion
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