The request is denied because of the Deny statement. In IAM, an explicit Deny always overrides any Allow, regardless of the order in which the policies are evaluated. Here, the Deny statement blocks all S3 actions on the sensitive prefix unless the source IP falls within the 10.0.0.0/8 range, and since 192.168.1.1 is outside that range, the Deny takes effect. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this concept tests your understanding of IAM policy evaluation logic, particularly how Deny statements can restrict S3 access by source IP even when other policies grant broader permissions. A common trap is assuming that an Allow for the user or group will bypass a Deny, but the key rule is that Deny is unconditional. Remember the mnemonic: "Deny dominates, Allow only if no Deny applies."
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. 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.
An IAM policy is attached to a group. A user in the group tries to read the object s3://data-lake-bucket/sensitive/file.txt from an IP address 192.168.1.1. What will happen?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The request is denied because of the Deny statement
The Deny statement explicitly denies any S3 action on the sensitive prefix when the source IP is not from 10.0.0.0/8. Since the IP 192.168.1.1 is not in that range, the Deny applies. Deny statements override Allow statements. So the user is denied access.
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 request is allowed because the Allow statement grants s3:GetObject
Why it's wrong here
Deny overrides Allow.
✗
The request is allowed because the Deny condition does not match
Why it's wrong here
Condition matches: IP not in 10.0.0.0/8.
✓
The request is denied because of the Deny statement
Why this is correct
Deny applies when condition is met.
Related concept
Standard ACLs match source addresses.
✗
The request is denied because the policy has no explicit Allow for the sensitive prefix
Why it's wrong here
The Allow is for all objects, but Deny overrides.
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 MLS-C01 ACL questions on filtering logic and placement.
Data Engineering — This question tests Data Engineering — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The request is denied because of the Deny statement — The Deny statement explicitly denies any S3 action on the sensitive prefix when the source IP is not from 10.0.0.0/8. Since the IP 192.168.1.1 is not in that range, the Deny applies. Deny statements override Allow statements. So the user is denied access.
What should I do if I get this MLS-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 MLS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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