← SOA-C02·Amazon Web Services

Question 449 of 1,546

Networking and Content Delivery →hardMultiple ChoiceObjective-mapped

SOA-C02 Networking and Content Delivery Practice Question

This SOA-C02 practice question tests your understanding of networking and content delivery. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 a VPC with multiple subnets. The SysOps administrator wants to ensure that EC2 instances in a private subnet can access Amazon S3 without going through a NAT Gateway or internet gateway. Which solution meets this requirement?

A
Set up a NAT Gateway in a public subnet and route traffic through it.
Why wrong: NAT Gateway still requires internet gateway.
B
Create a VPC Gateway Endpoint for S3.
Gateway Endpoint provides private access to S3.
C
Use S3 Transfer Acceleration.
Why wrong: Transfer Acceleration is for faster uploads, not private access.
D
Create a VPC Interface Endpoint for S3.
Why wrong: Interface Endpoint is possible but more expensive; Gateway Endpoint is better for S3.

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

✓

Create a VPC Gateway Endpoint for S3.

Option B is correct. A VPC Gateway Endpoint for S3 allows EC2 instances in a private subnet to access S3 privately without needing a NAT Gateway or internet gateway. Option A is incorrect because a NAT Gateway requires an internet gateway and does not provide private access. Option C is incorrect because S3 Transfer Acceleration is for faster transfers over the internet, not private connectivity. Option D is incorrect because although a VPC Interface Endpoint can also provide private access to S3, the Gateway Endpoint is the recommended solution for S3 due to lower cost and simpler configuration.

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.

✗
Set up a NAT Gateway in a public subnet and route traffic through it.
Why it's wrong here
NAT Gateway still requires internet gateway.
✓
Create a VPC Gateway Endpoint for S3.
Why this is correct
Gateway Endpoint provides private access to S3.
Related concept
CIDR notation defines the prefix length.
✗
Use S3 Transfer Acceleration.
Why it's wrong here
Transfer Acceleration is for faster uploads, not private access.
✗
Create a VPC Interface Endpoint for S3.
Why it's wrong here
Interface Endpoint is possible but more expensive; Gateway Endpoint is better for S3.

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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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 SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Networking and Content Delivery — This question tests Networking and Content Delivery — 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 B is correct. A VPC Gateway Endpoint for S3 allows EC2 instances in a private subnet to access S3 privately without needing a NAT Gateway or internet gateway. Option A is incorrect because a NAT Gateway requires an internet gateway and does not provide private access. Option C is incorrect because S3 Transfer Acceleration is for faster transfers over the internet, not private connectivity. Option D is incorrect because although a VPC Interface Endpoint can also provide private access to S3, the Gateway Endpoint is the recommended solution for S3 due to lower cost and simpler configuration.

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

What is the key concept behind this question?

CIDR notation defines the prefix length.

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