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Incident and Event Response →mediumMultiple ChoiceObjective-mapped

DOP-C02 Incident and Event Response Practice Question

This DOP-C02 practice question tests your understanding of incident and event response. 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 DevOps team uses AWS CodeDeploy to deploy an application to an Auto Scaling group. The deployment fails with an error 'The overall deployment failed because too many individual instances failed deployment'. The team checks the instance logs and finds that the 'BeforeInstall' lifecycle event script returned a non-zero exit code. What is the BEST approach to resolve this?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

A
Set the 'ignoreScriptFailure' option to true in the AppSpec file and redeploy.
Why wrong: Ignoring script failures can lead to inconsistent state.
B
Manually run the script on an instance and then resume the deployment.
Why wrong: Manual fix not scalable; deployment will still fail on other instances.
C
Fix the script error in the revision and redeploy.
Correcting the script ensures the deployment succeeds.
D
Change the deployment configuration to 'AllAtOnce' to speed up deployment.
Why wrong: Does not fix the script error.

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

✓

Fix the script error in the revision and redeploy.

Option C is correct because the deployment failed due to a script error in the BeforeInstall lifecycle event. The root cause is the script itself, so fixing the script error in the revision and redeploying addresses the issue permanently. Option A is wrong because setting 'ignoreScriptFailure' to true would mask the error and could lead to application issues. Option B is wrong because manually running the script on an instance does not fix the underlying issue in the revision, and the deployment will fail again. Option D is wrong because changing the deployment configuration to 'AllAtOnce' does not fix the script error and may cause more instances to fail simultaneously.

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 'ignoreScriptFailure' option to true in the AppSpec file and redeploy.
Why it's wrong here
Ignoring script failures can lead to inconsistent state.
✗
Manually run the script on an instance and then resume the deployment.
Why it's wrong here
Manual fix not scalable; deployment will still fail on other instances.
✓
Fix the script error in the revision and redeploy.
Why this is correct
Correcting the script ensures the deployment succeeds.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
Change the deployment configuration to 'AllAtOnce' to speed up deployment.
Why it's wrong here
Does not fix the script error.

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 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?

Incident and Event Response — This question tests Incident and Event Response — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Fix the script error in the revision and redeploy. — Option C is correct because the deployment failed due to a script error in the BeforeInstall lifecycle event. The root cause is the script itself, so fixing the script error in the revision and redeploying addresses the issue permanently. Option A is wrong because setting 'ignoreScriptFailure' to true would mask the error and could lead to application issues. Option B is wrong because manually running the script on an instance does not fix the underlying issue in the revision, and the deployment will fail again. Option D is wrong because changing the deployment configuration to 'AllAtOnce' does not fix the script error and may cause more instances to fail simultaneously.

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

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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