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Identity and Access Management →hardMultiple ChoiceObjective-mapped

SCS-C02 Identity and Access Management Practice Question

This SCS-C02 practice question tests your understanding of identity and access management. 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.

A company has an S3 bucket with a bucket policy that grants access to an IAM role. The security team wants to restrict access to only requests that originate from the company's VPC. How can this be achieved?

A
Create a new IAM role that can only be assumed by instances in the VPC.
Why wrong: This does not restrict the origin of the request to the VPC.
B
Add a condition in the IAM role policy using aws:SourceVpce.
Why wrong: The condition should be in the bucket policy, not the role policy.
C
Add a condition in the bucket policy using aws:SourceIp with the VPC CIDR range.
Why wrong: S3 requests from VPC via endpoint have a different source IP.
D
Add a condition in the bucket policy using aws:SourceVpce with the VPC endpoint ID.
This ensures requests come through the specified VPC endpoint.

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

✓

Add a condition in the bucket policy using aws:SourceVpce with the VPC endpoint ID.

To restrict S3 bucket access to only requests from the company's VPC, you must use a VPC endpoint for S3 (Gateway Endpoint) and add a condition in the bucket policy using the aws:SourceVpce key with the VPC endpoint ID. Option D correctly implements this. Option A is incorrect because creating a new IAM role does not restrict the source network. Option B is incorrect because aws:SourceVpce is used in resource-based policies (like bucket policies), not in IAM role trust policies. Option C is incorrect because the aws:SourceIp condition key is not effective for traffic that travels through a VPC endpoint, as the source IP is a private IP within the VPC and does not reliably represent the original client IP.

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.

✗
Create a new IAM role that can only be assumed by instances in the VPC.
Why it's wrong here
This does not restrict the origin of the request to the VPC.
✗
Add a condition in the IAM role policy using aws:SourceVpce.
Why it's wrong here
The condition should be in the bucket policy, not the role policy.
✗
Add a condition in the bucket policy using aws:SourceIp with the VPC CIDR range.
Why it's wrong here
S3 requests from VPC via endpoint have a different source IP.
✓
Add a condition in the bucket policy using aws:SourceVpce with the VPC endpoint ID.
Why this is correct
This ensures requests come through the specified VPC endpoint.
Related concept
CIDR notation defines the prefix length.

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 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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SCS-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SCS-C02 question test?

Identity and Access Management — This question tests Identity and Access Management — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Add a condition in the bucket policy using aws:SourceVpce with the VPC endpoint ID. — To restrict S3 bucket access to only requests from the company's VPC, you must use a VPC endpoint for S3 (Gateway Endpoint) and add a condition in the bucket policy using the aws:SourceVpce key with the VPC endpoint ID. Option D correctly implements this. Option A is incorrect because creating a new IAM role does not restrict the source network. Option B is incorrect because aws:SourceVpce is used in resource-based policies (like bucket policies), not in IAM role trust policies. Option C is incorrect because the aws:SourceIp condition key is not effective for traffic that travels through a VPC endpoint, as the source IP is a private IP within the VPC and does not reliably represent the original client IP.

What should I do if I get this SCS-C02 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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