DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. 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 uses AWS CloudFormation to manage infrastructure. They have a stack that includes a VPC, subnets, and EC2 instances. They want to update the AMI ID of an EC2 instance without causing downtime. Which TWO approaches meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a CloudFormation update with a rolling update policy on the Auto Scaling group.
Option A is correct because a rolling update can replace instances one at a time, minimizing downtime. Option D is correct because a custom resource can run a script to update the instance without replacing it. Option B is wrong because deleting and recreating the stack causes downtime. Option C is wrong because update with replacement replaces the instance, causing downtime. Option E is wrong because multi-AZ is for RDS, not EC2.
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 CloudFormation stack update with 'UpdatePolicy' set to 'AutoScalingRollingUpdate' and 'MinInstancesInService' set to 0.
Why it's wrong here
MinInstancesInService=0 allows all instances to be replaced at once, causing downtime.
✗
Delete the stack and recreate it with the new AMI.
Why it's wrong here
Causes downtime.
✓
Use a CloudFormation update with a rolling update policy on the Auto Scaling group.
Deploy the instances across multiple Availability Zones and update each zone separately.
Why it's wrong here
This is a pattern for RDS, not for EC2 instances.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Configuration Management and IaC — This question tests Configuration Management and IaC — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use a CloudFormation update with a rolling update policy on the Auto Scaling group. — Option A is correct because a rolling update can replace instances one at a time, minimizing downtime. Option D is correct because a custom resource can run a script to update the instance without replacing it. Option B is wrong because deleting and recreating the stack causes downtime. Option C is wrong because update with replacement replaces the instance, causing downtime. Option E is wrong because multi-AZ is for RDS, not EC2.
What should I do if I get this DOP-C02 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 DOP-C02 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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Question Discussion
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