- A
Place all tiers in public subnets and use security group rules to restrict access to app and DB tiers
Why wrong: Public subnets have direct route to internet, so tiers are exposed.
- B
Place web tier in public subnets with Internet Gateway, app and DB tiers in private subnets with a NAT Gateway for outbound traffic
This design provides internet access to web tier while isolating app and DB tiers.
- C
Place web tier in a public subnet and app and DB tiers in the same public subnet but with restrictive Network ACLs
Why wrong: Network ACLs can limit inbound but cannot prevent outbound internet access if route exists.
- D
Place all tiers in private subnets and attach an Internet Gateway to the private subnets for the web tier
Why wrong: Internet Gateway requires a public subnet route table.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 is designing a network for a multi-tier application that includes a web tier, application tier, and database tier. The web tier must be accessible from the internet, while the application and database tiers should have no direct internet access. All tiers are in the same VPC. Which configuration meets these requirements?
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
Place web tier in public subnets with Internet Gateway, app and DB tiers in private subnets with a NAT Gateway for outbound traffic
Option A is correct because public subnets for web tier and private subnets for app and DB tiers with NAT Gateway for outbound access is a standard design. Option B is wrong because placing all tiers in public subnets exposes app and DB to internet. Option C is wrong because using Internet Gateway on private subnets defeats the purpose. Option D is wrong because Network ACLs alone do not prevent internet access if routes exist.
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.
- ✗
Place all tiers in public subnets and use security group rules to restrict access to app and DB tiers
Why it's wrong here
Public subnets have direct route to internet, so tiers are exposed.
- ✓
Place web tier in public subnets with Internet Gateway, app and DB tiers in private subnets with a NAT Gateway for outbound traffic
Why this is correct
This design provides internet access to web tier while isolating app and DB tiers.
Related concept
CIDR notation defines the prefix length.
- ✗
Place web tier in a public subnet and app and DB tiers in the same public subnet but with restrictive Network ACLs
Why it's wrong here
Network ACLs can limit inbound but cannot prevent outbound internet access if route exists.
- ✗
Place all tiers in private subnets and attach an Internet Gateway to the private subnets for the web tier
Why it's wrong here
Internet Gateway requires a public subnet 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.
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 Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Place web tier in public subnets with Internet Gateway, app and DB tiers in private subnets with a NAT Gateway for outbound traffic — Option A is correct because public subnets for web tier and private subnets for app and DB tiers with NAT Gateway for outbound access is a standard design. Option B is wrong because placing all tiers in public subnets exposes app and DB to internet. Option C is wrong because using Internet Gateway on private subnets defeats the purpose. Option D is wrong because Network ACLs alone do not prevent internet access if routes exist.
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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