Question 727 of 997

Cloud Architecture and Design →hardMultiple ChoiceObjective-mapped

CV0-004 Cloud Architecture and Design Practice Question

This CV0-004 practice question tests your understanding of cloud architecture and design. 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.

An organization is designing a VPC with public and private subnets. The web servers must be accessible from the internet, but database servers must not. The architecture also requires high availability across two Availability Zones. What is the minimum number of public subnets and private subnets needed?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Two public, two private
Each AZ gets a public and a private subnet.
B
One public, two private
Why wrong: Public subnets need two AZs for web servers.
C
Two public, one private
Why wrong: Private subnets should also be in two AZs for redundancy.
D
One public, one private
Why wrong: This provides no AZ redundancy.

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

✓

Two public, two private

For high availability across two AZs, you need at least two public subnets (one per AZ) and two private subnets (one per AZ).

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.

✓
Two public, two private
Why this is correct
Each AZ gets a public and a private subnet.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
One public, two private
Why it's wrong here
Public subnets need two AZs for web servers.
✗
Two public, one private
Why it's wrong here
Private subnets should also be in two AZs for redundancy.
✗
One public, one private
Why it's wrong here
This provides no AZ redundancy.

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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.

Visual reference

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 CV0-004 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this CV0-004 question test?

Cloud Architecture and Design — This question tests Cloud Architecture and Design — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Two public, two private — For high availability across two AZs, you need at least two public subnets (one per AZ) and two private subnets (one per AZ).

What should I do if I get this CV0-004 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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Last reviewed: Jul 4, 2026

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