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SAA-C03 Design Resilient Architectures Practice Question

This SAA-C03 practice question tests your understanding of design resilient architectures. 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.

Order the steps for setting up a VPC with public and private subnets using a NAT gateway.

A
Create VPC, Create public and private subnets, Create and attach Internet Gateway, Create NAT Gateway, Update route tables for public and private subnets
This is the correct order because you must first create the VPC, then create subnets within it, then create and attach an Internet Gateway to provide internet access, then create a NAT Gateway in a public subnet to allow private instances to reach the internet, and finally update route tables to direct traffic appropriately.
B
Create VPC, Create public and private subnets, Create NAT Gateway, Create and attach Internet Gateway, Update route tables for public and private subnets
Why wrong: This is incorrect because the NAT Gateway requires an Internet Gateway to be attached to the VPC first. Without the IGW, the NAT Gateway cannot be associated with a public subnet, and it will fail to allocate an Elastic IP.
C
Create VPC, Create and attach Internet Gateway, Create NAT Gateway, Create public and private subnets, Update route tables for public and private subnets
Why wrong: This is incorrect because the NAT Gateway must be placed in a public subnet. If subnets are created after the NAT Gateway, there is no subnet to associate it with, causing the NAT Gateway creation to fail.
D
Create VPC, Create public and private subnets, Update route tables for public and private subnets, Create and attach Internet Gateway, Create NAT Gateway
Why wrong: This is incorrect because route tables cannot reference the Internet Gateway or NAT Gateway before they exist. Updating route tables too early would result in routes pointing to non-existent gateways, leading to connectivity issues.

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 VPC, Create public and private subnets, Create and attach Internet Gateway, Create NAT Gateway, Update route tables for public and private subnets

VPC creation comes first, then subnets, IGW, NAT Gateway, and finally route table updates.

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.

✓
Create VPC, Create public and private subnets, Create and attach Internet Gateway, Create NAT Gateway, Update route tables for public and private subnets
Why this is correct
This is the correct order because you must first create the VPC, then create subnets within it, then create and attach an Internet Gateway to provide internet access, then create a NAT Gateway in a public subnet to allow private instances to reach the internet, and finally update route tables to direct traffic appropriately.
Related concept
CIDR notation defines the prefix length.
✗
Create VPC, Create public and private subnets, Create NAT Gateway, Create and attach Internet Gateway, Update route tables for public and private subnets
Why it's wrong here
This is incorrect because the NAT Gateway requires an Internet Gateway to be attached to the VPC first. Without the IGW, the NAT Gateway cannot be associated with a public subnet, and it will fail to allocate an Elastic IP.
✗
Create VPC, Create and attach Internet Gateway, Create NAT Gateway, Create public and private subnets, Update route tables for public and private subnets
Why it's wrong here
This is incorrect because the NAT Gateway must be placed in a public subnet. If subnets are created after the NAT Gateway, there is no subnet to associate it with, causing the NAT Gateway creation to fail.
✗
Create VPC, Create public and private subnets, Update route tables for public and private subnets, Create and attach Internet Gateway, Create NAT Gateway
Why it's wrong here
This is incorrect because route tables cannot reference the Internet Gateway or NAT Gateway before they exist. Updating route tables too early would result in routes pointing to non-existent gateways, leading to connectivity issues.

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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

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 SAA-C03 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SAA-C03 question test?

Design Resilient Architectures — This question tests Design Resilient Architectures — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Create VPC, Create public and private subnets, Create and attach Internet Gateway, Create NAT Gateway, Update route tables for public and private subnets — VPC creation comes first, then subnets, IGW, NAT Gateway, and finally route table updates.

What should I do if I get this SAA-C03 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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