Question 305 of 500

AI Models and Data Engineering →mediumMultiple ChoiceObjective-mapped

AI0-001 AI Models and Data Engineering Practice Question

This AI0-001 practice question tests your understanding of ai models and data engineering. 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.

Exhibit

Refer to the exhibit.

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::ml-training-data/*",
      "Condition": {
        "IpAddress": {
          "aws:SourceIp": "10.0.0.0/16"
        }
      }
    }
  ]
}
```

A data engineer is reviewing an S3 bucket policy for a machine learning project. The policy is intended to allow access to training data only from the corporate network (10.0.0.0/16). However, users in the corporate network report access denied. Which issue is most likely causing the problem?

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.

Question 1mediummultiple choice

Full question →

Exhibit

Refer to the exhibit.

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::ml-training-data/*",
      "Condition": {
        "IpAddress": {
          "aws:SourceIp": "10.0.0.0/16"
        }
      }
    }
  ]
}
```

A
The policy is missing a Deny statement.
Why wrong: Allow is sufficient if conditions are met.
B
The resource ARN is incorrect.
Why wrong: The ARN looks correct for the bucket.
C
The policy does not include s3:ListBucket action, which is needed to list objects.
Users need ListBucket to see objects before getting them.
D
The IP address condition is not matching because the corporate network uses a different CIDR.
Why wrong: The CIDR is given as 10.0.0.0/16.

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 does not include s3:ListBucket action, which is needed to list objects.

Option C is correct. The condition key uses "aws:SourceIp" but the correct key for IP address condition is "aws:SourceIp". However, the exhibit shows "aws:SourceIp" which is correct? Wait, the exhibit shows "aws:SourceIp" — that is correct. But the problem might be that the policy uses "GetObject" but the users might be trying to list objects (s3:ListBucket). Option C says the action does not include s3:ListBucket, which is often needed first. Option A is wrong because the resource is correct. Option B is wrong because the policy allows access from 10.0.0.0/16. Option D is wrong because the effect is Allow.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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 is missing a Deny statement.
Why it's wrong here
Allow is sufficient if conditions are met.
✗
The resource ARN is incorrect.
Why it's wrong here
The ARN looks correct for the bucket.
✓
The policy does not include s3:ListBucket action, which is needed to list objects.
Why this is correct
Users need ListBucket to see objects before getting them.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
The IP address condition is not matching because the corporate network uses a different CIDR.
Why it's wrong here
The CIDR is given as 10.0.0.0/16.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Real-world example

How this comes up in practice

A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AI0-001 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this AI0-001 question test?

AI Models and Data Engineering — This question tests AI Models and Data Engineering — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The policy does not include s3:ListBucket action, which is needed to list objects. — Option C is correct. The condition key uses "aws:SourceIp" but the correct key for IP address condition is "aws:SourceIp". However, the exhibit shows "aws:SourceIp" which is correct? Wait, the exhibit shows "aws:SourceIp" — that is correct. But the problem might be that the policy uses "GetObject" but the users might be trying to list objects (s3:ListBucket). Option C says the action does not include s3:ListBucket, which is often needed first. Option A is wrong because the resource is correct. Option B is wrong because the policy allows access from 10.0.0.0/16. Option D is wrong because the effect is Allow.

What should I do if I get this AI0-001 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?

CIDR notation defines the prefix length.

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Last reviewed: Jun 22, 2026

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