The answer is that the script is not using HTTPS, so the Deny statement blocks all actions. This occurs because the IAM policy includes a condition with `aws:SecureTransport` set to false, which triggers an explicit Deny on any API call made over non-secure transport. Since the SAP automation script is likely sending requests via HTTP instead of HTTPS, the Deny overrides any Allow statements for `ec2:StartInstances`, causing the failure. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how `aws:SecureTransport` conditions work in IAM policies, often appearing as a trap where examinees overlook the explicit Deny effect. A common memory tip is to remember that "SecureTransport = false" means "Deny all unless HTTPS," so always check the protocol used by your automation scripts.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
Refer to the exhibit. An IAM policy is attached to an IAM role used by an SAP automation script. The script is failing to start an EC2 instance. What is the most likely cause?
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 script is not using HTTPS, so the Deny statement blocks all actions.
Option A is correct because the policy has an explicit Deny effect when aws:SecureTransport is false, meaning the script must use HTTPS. If the script uses HTTP (non-secure transport), the Deny statement blocks all actions including StartInstances. Option B is wrong because the policy allows ec2:StartInstances on all resources. Option C is wrong because the policy allows ec2:DescribeInstances and StartInstances. Option D is wrong because the policy allows s3:GetObject and s3:PutObject on the specific bucket.
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 grant permission to start instances.
Why it's wrong here
The policy allows ec2:StartInstances on all resources.
✗
The policy does not allow ec2:DescribeInstances.
Why it's wrong here
The policy allows ec2:DescribeInstances.
✗
The script does not have access to the S3 bucket.
Why it's wrong here
The policy allows s3:GetObject and s3:PutObject on the bucket.
✓
The script is not using HTTPS, so the Deny statement blocks all actions.
Why this is correct
The Deny statement with aws:SecureTransport: false blocks all actions if not using HTTPS.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 PAS-C01 ACL questions on filtering logic and placement.
Technology — This question tests Technology — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The script is not using HTTPS, so the Deny statement blocks all actions. — Option A is correct because the policy has an explicit Deny effect when aws:SecureTransport is false, meaning the script must use HTTPS. If the script uses HTTP (non-secure transport), the Deny statement blocks all actions including StartInstances. Option B is wrong because the policy allows ec2:StartInstances on all resources. Option C is wrong because the policy allows ec2:DescribeInstances and StartInstances. Option D is wrong because the policy allows s3:GetObject and s3:PutObject on the specific bucket.
What should I do if I get this PAS-C01 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 PAS-C01 ACL questions on filtering logic and placement.
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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