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Question 807 of 1,738

Infrastructure Security →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to create a VPC interface endpoint for AWS Systems Manager and use Systems Manager Patch Manager to apply patches. This solution works because the VPC endpoint enables private, outbound-only communication to the Systems Manager service over the AWS network, allowing the instance to download patches from the specified domain without any internet gateway or NAT device. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how to maintain a completely isolated VPC while still performing essential maintenance tasks, often appearing as a trap where candidates mistakenly choose a NAT gateway or proxy. The key trap is remembering that a NAT gateway requires an internet gateway, which violates the no-internet-route requirement. For a memory tip, think “SSM for secure, silent patching” — Systems Manager’s VPC endpoint is the only way to download patches without any internet path, keeping the VPC truly private.

SCS-C02 Infrastructure Security Practice Question

This SCS-C02 practice question tests your understanding of infrastructure security. 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 is configuring a VPC for a highly sensitive application. The VPC must not have a route to the internet, but the application needs to periodically download security patches from a specific domain (patches.example.com). Which solution meets these requirements with minimal operational overhead?

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

A
Launch a proxy server in a public subnet and configure the application to use the proxy.
Why wrong: The proxy server requires internet access, and the VPC would need an internet gateway.
B
Use a VPC endpoint for Amazon S3 and DynamoDB to download patches.
Why wrong: VPC endpoints are for specific AWS services, not for accessing external domains.
C
Create a VPC interface endpoint for AWS Systems Manager and use Systems Manager Patch Manager to apply patches.
Systems Manager can manage patches without internet access via VPC endpoints, and Patch Manager supports custom patch baselines.
D
Deploy a NAT gateway in a public subnet and add a route to the NAT gateway for the private subnet.
Why wrong: NAT gateway requires an internet gateway, which would expose the VPC to the internet.

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 interface endpoint for AWS Systems Manager and use Systems Manager Patch Manager to apply patches.

Option C is correct because VPC endpoints for S3 and DynamoDB are for specific services, not general internet access. Option A is wrong because a NAT gateway requires an internet gateway and a route to the internet. Option B is wrong because a proxy would still need outbound internet access. Option D is correct because a VPC interface endpoint for AWS Systems Manager allows outbound-only communication to download patches without internet access.

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.

✗
Launch a proxy server in a public subnet and configure the application to use the proxy.
Why it's wrong here
The proxy server requires internet access, and the VPC would need an internet gateway.
✗
Use a VPC endpoint for Amazon S3 and DynamoDB to download patches.
Why it's wrong here
VPC endpoints are for specific AWS services, not for accessing external domains.
✓
Create a VPC interface endpoint for AWS Systems Manager and use Systems Manager Patch Manager to apply patches.
Why this is correct
Systems Manager can manage patches without internet access via VPC endpoints, and Patch Manager supports custom patch baselines.
Related concept
CIDR notation defines the prefix length.
✗
Deploy a NAT gateway in a public subnet and add a route to the NAT gateway for the private subnet.
Why it's wrong here
NAT gateway requires an internet gateway, which would expose the VPC to the internet.

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 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?

Infrastructure Security — This question tests Infrastructure Security — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Create a VPC interface endpoint for AWS Systems Manager and use Systems Manager Patch Manager to apply patches. — Option C is correct because VPC endpoints for S3 and DynamoDB are for specific services, not general internet access. Option A is wrong because a NAT gateway requires an internet gateway and a route to the internet. Option B is wrong because a proxy would still need outbound internet access. Option D is correct because a VPC interface endpoint for AWS Systems Manager allows outbound-only communication to download patches without internet access.

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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