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SDLC Automation →mediumMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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 as code. They have a stack that creates an Amazon RDS database instance. The database password is stored as a parameter in AWS Systems Manager Parameter Store. The CloudFormation template references the parameter using the 'resolve:ssm' dynamic reference. Recently, a security audit found that the password was exposed in plaintext in the CloudFormation stack outputs. The team wants to prevent sensitive information from being displayed in stack outputs or logs. Which approach should be taken?

A
Set the 'NoEcho' property to 'true' for the parameter in the template
Why wrong: Setting 'NoEcho' to 'true' on a template parameter masks the parameter input but does not prevent the resolved value from 'resolve:ssm' from appearing in outputs.
B
Store the password in AWS Secrets Manager and reference it in the template
Why wrong: Storing the password in Secrets Manager is a good practice but does not prevent the value from being displayed in outputs if it is still referenced there.
C
Remove the output from the CloudFormation stack
Removing the output directly prevents the password from being displayed in stack outputs or logs, which is the most effective solution.
D
Encrypt the output value using AWS KMS
Why wrong: CloudFormation outputs cannot be individually encrypted with KMS; this is not a supported feature.

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

✓

Remove the output from the CloudFormation stack

Option C is correct. Removing the output from the CloudFormation stack is the most direct way to prevent the password from being displayed in outputs or logs. Dynamic references like 'resolve:ssm' resolve the value at stack creation/update time, and if that value is included in an output, it will be displayed in plaintext. Setting 'NoEcho' on a template parameter does not affect the resolved value; it only masks the parameter's value in the console when entering it, not the output of a dynamic reference. Option B (Secrets Manager) is a better practice for storing secrets but does not prevent exposure if the secret is still referenced in an output. Option D (KMS encryption of outputs) is not supported.

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.

✗
Set the 'NoEcho' property to 'true' for the parameter in the template
Why it's wrong here
Setting 'NoEcho' to 'true' on a template parameter masks the parameter input but does not prevent the resolved value from 'resolve:ssm' from appearing in outputs.
✗
Store the password in AWS Secrets Manager and reference it in the template
Why it's wrong here
Storing the password in Secrets Manager is a good practice but does not prevent the value from being displayed in outputs if it is still referenced there.
✓
Remove the output from the CloudFormation stack
Why this is correct
Removing the output directly prevents the password from being displayed in stack outputs or logs, which is the most effective solution.
Related concept
CIDR notation defines the prefix length.
✗
Encrypt the output value using AWS KMS
Why it's wrong here
CloudFormation outputs cannot be individually encrypted with KMS; this is not a supported feature.

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.

Trap categories for this question

Command / output trap
Setting 'NoEcho' to 'true' on a template parameter masks the parameter input but does not prevent the resolved value from 'resolve:ssm' from appearing in outputs.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Remove the output from the CloudFormation stack — Option C is correct. Removing the output from the CloudFormation stack is the most direct way to prevent the password from being displayed in outputs or logs. Dynamic references like 'resolve:ssm' resolve the value at stack creation/update time, and if that value is included in an output, it will be displayed in plaintext. Setting 'NoEcho' on a template parameter does not affect the resolved value; it only masks the parameter's value in the console when entering it, not the output of a dynamic reference. Option B (Secrets Manager) is a better practice for storing secrets but does not prevent exposure if the secret is still referenced in an output. Option D (KMS encryption of outputs) is not supported.

What should I do if I get this DOP-C02 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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