- A
Use a VPC Gateway Endpoint for the web tier to access the internet.
Why wrong: Gateway Endpoints are for services like S3 and DynamoDB, not for general internet access.
- B
Use a NAT gateway in a public subnet to provide internet access to the app and database tiers for updates.
Why wrong: NAT gateway provides outbound internet access, but the requirement is to prevent internet access to app and database tiers from inbound.
- C
Use a security group on the web tier to allow HTTP/HTTPS from 0.0.0.0/0, and security groups on the app and database tiers that only allow traffic from the web tier security group.
Security groups provide granular control; web tier allows internet, app and database only accept traffic from web.
- D
Place all tiers in a public subnet with a security group that restricts access to the app and database tiers.
Why wrong: Placing app and database in public subnets exposes them to the internet, which is not allowed.
- E
Place the web tier in a public subnet with an internet gateway in the route table, and the app and database tiers in private subnets.
Public subnet for web allows internet access; private subnets for app and database prevent direct internet access.
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 company is designing a network security architecture for a multi-tier application. The web tier must be accessible from the internet, but the application and database tiers must not. Which TWO design choices meet these requirements? (Choose two.)
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
Use a security group on the web tier to allow HTTP/HTTPS from 0.0.0.0/0, and security groups on the app and database tiers that only allow traffic from the web tier security group.
Options B and C are correct because public subnets for the web tier with a security group that allows HTTP/HTTPS from the internet, and private subnets for app and database tiers with no internet gateway route, ensure the required access. Option A is wrong because a single public subnet for all tiers exposes app and database. Option D is wrong because a NAT gateway is for outbound traffic, not inbound. Option E is wrong because a VPC endpoint does not provide internet access to the web tier.
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 VPC Gateway Endpoint for the web tier to access the internet.
Why it's wrong here
Gateway Endpoints are for services like S3 and DynamoDB, not for general internet access.
- ✗
Use a NAT gateway in a public subnet to provide internet access to the app and database tiers for updates.
- ✓
Use a security group on the web tier to allow HTTP/HTTPS from 0.0.0.0/0, and security groups on the app and database tiers that only allow traffic from the web tier security group.
Why this is correct
Security groups provide granular control; web tier allows internet, app and database only accept traffic from web.
Related concept
CIDR notation defines the prefix length.
- ✗
Place all tiers in a public subnet with a security group that restricts access to the app and database tiers.
Why it's wrong here
Placing app and database in public subnets exposes them to the internet, which is not allowed.
- ✓
Place the web tier in a public subnet with an internet gateway in the route table, and the app and database tiers in private subnets.
Why this is correct
Public subnet for web allows internet access; private subnets for app and database prevent direct internet access.
Related concept
CIDR notation defines the prefix length.
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 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: Use a security group on the web tier to allow HTTP/HTTPS from 0.0.0.0/0, and security groups on the app and database tiers that only allow traffic from the web tier security group. — Options B and C are correct because public subnets for the web tier with a security group that allows HTTP/HTTPS from the internet, and private subnets for app and database tiers with no internet gateway route, ensure the required access. Option A is wrong because a single public subnet for all tiers exposes app and database. Option D is wrong because a NAT gateway is for outbound traffic, not inbound. Option E is wrong because a VPC endpoint does not provide internet access to the web tier.
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
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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