The answer is to set the 'NoEcho' property to 'true' for the parameter in the CloudFormation template. This is correct because the NoEcho attribute, when applied to a parameter, masks the value in stack outputs and logs, preventing plaintext exposure of sensitive data like database passwords even when the parameter is referenced via dynamic references like resolve:ssm. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of CloudFormation security best practices, specifically how to control output visibility without breaking automation that depends on those outputs. A common trap is assuming encryption or Secrets Manager alone solves the issue, but they do not prevent the value from being echoed in outputs. Remember the mnemonic: "NoEcho, No Exposure" — if you don't want it seen, set NoEcho to true.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the 'NoEcho' property to 'true' for the parameter in the template
To prevent sensitive data from being shown in outputs or logs, use the 'NoEcho' property set to 'true' in the CloudFormation template parameter. This will mask the value in outputs. Option B is correct. Option A (encrypt the output) is not possible because outputs are not encrypted. Option C (remove the output) would prevent exposure but may break automation that depends on the output. Option D (use AWS Secrets Manager) is good but does not directly solve the output exposure issue.
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 this is correct
NoEcho masks the parameter value in outputs and logs
Store the password in AWS Secrets Manager and reference it in the template
Why it's wrong here
Secrets Manager references are still subject to output exposure if not masked
✗
Remove the output from the CloudFormation stack
Why it's wrong here
Removing output may break dependent stacks or automation
✗
Encrypt the output value using AWS KMS
Why it's wrong here
CloudFormation outputs cannot be encrypted; they are shown as plaintext
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
Secrets Manager references are still subject to output exposure if not masked
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.
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.
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: Set the 'NoEcho' property to 'true' for the parameter in the template — To prevent sensitive data from being shown in outputs or logs, use the 'NoEcho' property set to 'true' in the CloudFormation template parameter. This will mask the value in outputs. Option B is correct. Option A (encrypt the output) is not possible because outputs are not encrypted. Option C (remove the output) would prevent exposure but may break automation that depends on the output. Option D (use AWS Secrets Manager) is good but does not directly solve the output exposure issue.
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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