- A
Attach an Internet Gateway to the VPC.
Why wrong: Internet Gateway provides internet access, not private access to S3.
- B
Use AWS Direct Connect to connect to S3.
Why wrong: Direct Connect is for on-premises, not for EC2 within AWS.
- C
Create a VPC Gateway Endpoint for S3.
Provides private connectivity to S3 without internet.
- D
Deploy a NAT gateway in a public subnet and update the route table.
Why wrong: NAT gateway routes traffic to the internet, not private.
Question 620 of 1,705
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 security engineer needs to allow an EC2 instance in a private subnet to access an S3 bucket without traversing the internet. Which solution meets this requirement?
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
✓
Create a VPC Gateway Endpoint for S3.
Option C is correct because a VPC Gateway Endpoint for S3 allows private connectivity between EC2 instances in a private subnet and S3 without traversing the internet. Option A is incorrect because an Internet Gateway provides internet access, not private connectivity to S3. Option B is incorrect because Direct Connect is typically used for hybrid connectivity between on-premises and AWS, not for EC2 to S3 within the same region. Option D is incorrect because a NAT gateway allows outbound internet traffic from private subnets, but traffic would still go over the internet, not privately.
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.
- ✗
Attach an Internet Gateway to the VPC.
Why it's wrong here
Internet Gateway provides internet access, not private access to S3.
- ✗
Use AWS Direct Connect to connect to S3.
Why it's wrong here
Direct Connect is for on-premises, not for EC2 within AWS.
- ✓
Create a VPC Gateway Endpoint for S3.
Why this is correct
Provides private connectivity to S3 without internet.
Related concept
CIDR notation defines the prefix length.
- ✗
Deploy a NAT gateway in a public subnet and update the route table.
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.
Visual reference
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 ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create a VPC Gateway Endpoint for S3. — Option C is correct because a VPC Gateway Endpoint for S3 allows private connectivity between EC2 instances in a private subnet and S3 without traversing the internet. Option A is incorrect because an Internet Gateway provides internet access, not private connectivity to S3. Option B is incorrect because Direct Connect is typically used for hybrid connectivity between on-premises and AWS, not for EC2 to S3 within the same region. Option D is incorrect because a NAT gateway allows outbound internet traffic from private subnets, but traffic would still go over the internet, not privately.
What should I do if I get this ANS-C01 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 ANS-C01 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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Last reviewed: Jun 20, 2026
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