SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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 attached the above IAM policy to an IAM role used by an EC2 instance. The EC2 instance is in a VPC with CIDR 10.0.0.0/16 and has a public IP. Which of the following statements is true regarding access to the S3 bucket?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The EC2 instance can perform GetObject and PutObject operations only if it uses a VPC endpoint
The Deny statement with aws:SecureTransport=false blocks any request not using HTTPS, even if the Allow statement matches. The Allow statement only allows from 10.0.0.0/8, so EC2 with public IP will be denied because its source IP will be the public 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.
✗
The EC2 instance can perform GetObject and PutObject operations if it uses HTTPS
Why it's wrong here
The source IP condition blocks it.
✗
The EC2 instance cannot perform any S3 operations because the Deny statement blocks all requests
Why it's wrong here
Deny only blocks when SecureTransport=false; if HTTPS, Deny does not apply.
✗
The EC2 instance can perform GetObject and PutObject operations from within the VPC
Why it's wrong here
The source IP will be the public IP if traffic goes through NAT.
✓
The EC2 instance can perform GetObject and PutObject operations only if it uses a VPC endpoint
Why this is correct
A VPC endpoint ensures source IP is from within 10.0.0.0/8.
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.
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 SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Design for New Solutions — This question tests Design for New Solutions — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The EC2 instance can perform GetObject and PutObject operations only if it uses a VPC endpoint — The Deny statement with aws:SecureTransport=false blocks any request not using HTTPS, even if the Allow statement matches. The Allow statement only allows from 10.0.0.0/8, so EC2 with public IP will be denied because its source IP will be the public IP.
What should I do if I get this SAP-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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