This SOA-C02 practice question tests your understanding of security and compliance. 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 EC2 instance that needs to access an S3 bucket. The instance is launched in a private subnet with no internet gateway. What is the most secure way to provide access to S3 without traversing the internet?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an S3 VPC gateway endpoint
To provide access to S3 from a private subnet without an internet gateway, you can use an S3 VPC endpoint (Gateway type). This allows instances in the VPC to access S3 privately using the AWS network. Option C is correct. Option A is wrong because a NAT gateway would route traffic through the internet, which is less secure and requires an internet gateway. Option B is wrong because an internet gateway is needed for a NAT instance. Option D is wrong because AWS Direct Connect does not eliminate the need for a VPC endpoint; it provides a dedicated connection but still requires routing through the internet unless a VPC endpoint is used.
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.
✗
Use a NAT gateway in a public subnet
Why it's wrong here
NATgateway routes traffic through the internet, not private.
✓
Create an S3 VPC gateway endpoint
Why this is correct
S3 VPC endpoint allows private access to S3 without internet.
Direct Connect does not provide private access to S3 without a VPC endpoint.
✗
Attach an internet gateway to the VPC and a public IP to the instance
Why it's wrong here
This would expose the instance to the internet and is not secure.
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.
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 SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Security and Compliance — This question tests Security and Compliance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create an S3 VPC gateway endpoint — To provide access to S3 from a private subnet without an internet gateway, you can use an S3 VPC endpoint (Gateway type). This allows instances in the VPC to access S3 privately using the AWS network. Option C is correct. Option A is wrong because a NAT gateway would route traffic through the internet, which is less secure and requires an internet gateway. Option B is wrong because an internet gateway is needed for a NAT instance. Option D is wrong because AWS Direct Connect does not eliminate the need for a VPC endpoint; it provides a dedicated connection but still requires routing through the internet unless a VPC endpoint is used.
What should I do if I get this SOA-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 SOA-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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