- A
EnableDnsSupport on the VPC
Why wrong: EnableDnsSupport enables DNS resolution.
- B
MapPublicIpOnLaunch on the subnet
MapPublicIpOnLaunch automatically assigns public IPs to instances in the subnet.
- C
EnableDnsHostnames on the VPC
Why wrong: EnableDnsHostnames allows DNS hostnames, not public IP assignment.
- D
AssociatePublicIpAddress on the instance
Why wrong: AssociatePublicIpAddress is an instance-level property, but the question asks for subnet-level.
Question 1,585 of 1,750
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 DevOps engineer is using AWS CloudFormation to deploy a stack that includes a VPC with public and private subnets. The engineer wants to ensure that the public subnets automatically get a public IP address assigned to instances launched in them. Which property should be set?
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
✓
MapPublicIpOnLaunch on the subnet
Option B is correct because the `MapPublicIpOnLaunch` property on an AWS CloudFormation `AWS::EC2::Subnet` resource controls whether instances launched in that subnet automatically receive a public IP address. Setting this property to `true` ensures that any EC2 instance launched in the public subnet gets a public IPv4 address from the subnet's CIDR range, which is essential for internet-facing resources in a VPC.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
EnableDnsSupport on the VPC
Why it's wrong here
EnableDnsSupport enables DNS resolution.
- ✓
MapPublicIpOnLaunch on the subnet
Why this is correct
MapPublicIpOnLaunch automatically assigns public IPs to instances in the subnet.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EnableDnsHostnames on the VPC
Why it's wrong here
EnableDnsHostnames allows DNS hostnames, not public IP assignment.
- ✗
AssociatePublicIpAddress on the instance
Why it's wrong here
AssociatePublicIpAddress is an instance-level property, but the question asks for subnet-level.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC-level DNS settings (`EnableDnsSupport` and `EnableDnsHostnames`) with subnet-level public IP assignment, or they mistakenly think the instance-level `AssociatePublicIpAddress` is the only way to control public IP assignment, ignoring the subnet-level auto-assign feature.
Detailed technical explanation
How to think about this question
Under the hood, `MapPublicIpOnLaunch` modifies the subnet's network interface attribute that controls the `auto-assign public IPv4 address` setting in the VPC console. When an instance is launched, the EC2 service checks this subnet-level flag; if `true`, it automatically attaches a public IP to the primary network interface (eth0) from the VPC's public IP pool. This behavior is distinct from Elastic IPs, which are static, and from IPv6, which uses a different mechanism (e.g., `AssignIpv6AddressOnCreation`). In real-world scenarios, failing to set this property in a public subnet for an Auto Scaling group can cause instances to lack public IPs, breaking internet connectivity for web servers.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: MapPublicIpOnLaunch on the subnet — Option B is correct because the `MapPublicIpOnLaunch` property on an AWS CloudFormation `AWS::EC2::Subnet` resource controls whether instances launched in that subnet automatically receive a public IP address. Setting this property to `true` ensures that any EC2 instance launched in the public subnet gets a public IPv4 address from the subnet's CIDR range, which is essential for internet-facing resources in a VPC.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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