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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. 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 team uses AWS CodeDeploy to deploy an application to an Auto Scaling group. The deployment is configured with a deployment configuration that uses the 'CodeDeployDefault.OneAtATime' traffic routing. However, during deployment, the new instances are failing health checks and the deployment is rolling back. The team wants to minimize the impact on users. What should the team do to detect issues earlier?

Clue words in this question

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

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Change the deployment configuration to 'CodeDeployDefault.AllAtOnce'.
Why wrong: This updates all instances at once, risking full outage.
B
Use a canary deployment configuration that shifts 10% of traffic initially.
Canary deployments allow early detection of issues with minimal impact.
C
Increase the batch size to deploy to multiple instances at once.
Why wrong: This could cause more instances to fail at once.
D
Add a manual approval step in the pipeline before the deployment.
Why wrong: Manual approval does not automate early detection.

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

✓

Use a canary deployment configuration that shifts 10% of traffic initially.

Option B is correct because a canary deployment (e.g., shifting 10% of traffic initially) allows the team to detect health check failures on a small subset of new instances before the full rollout. This minimizes user impact by limiting exposure to potentially faulty code, while still catching issues earlier than a one-at-a-time deployment. The 'CodeDeployDefault.OneAtATime' configuration already deploys to one instance at a time, but a canary reduces the blast radius further by routing only a fraction of traffic to the new instances.

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.

✗
Change the deployment configuration to 'CodeDeployDefault.AllAtOnce'.
Why it's wrong here
This updates all instances at once, risking full outage.
✓
Use a canary deployment configuration that shifts 10% of traffic initially.
Why this is correct
Canary deployments allow early detection of issues with minimal impact.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the batch size to deploy to multiple instances at once.
Why it's wrong here
This could cause more instances to fail at once.
✗
Add a manual approval step in the pipeline before the deployment.
Why it's wrong here
Manual approval does not automate early detection.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse 'detecting issues earlier' with 'deploying faster' or 'increasing batch size,' when in fact a canary deployment reduces the blast radius and provides early detection through traffic shifting, not by deploying to more instances simultaneously.

Detailed technical explanation

How to think about this question

Under the hood, CodeDeploy's canary deployment configuration (e.g., 'CodeDeployDefault.Canary10Percent5Minutes') shifts 10% of traffic to the new Amazon EC2 instances for 5 minutes, allowing health checks to validate the new version before shifting the remaining 90%. This leverages Elastic Load Balancing's target group health checks, which can be configured with custom thresholds (e.g., 5 consecutive failures) to trigger a rollback. In a real-world scenario, this is critical for high-traffic applications where a single faulty instance could degrade performance for a significant user base.

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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

Quick reference

AAA Protocol Comparison

Protocol	Port(s)	Encryption	Transport	Primary Use
RADIUS	1812 / 1813	Password only	UDP	Network access control
TACACS+	49	Full packet	TCP	Device administration
Diameter	3868	Full session	TCP / SCTP	Carrier / mobile networks
802.1X	—	EAP-based	Layer 2	Port-based access control

TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use a canary deployment configuration that shifts 10% of traffic initially. — Option B is correct because a canary deployment (e.g., shifting 10% of traffic initially) allows the team to detect health check failures on a small subset of new instances before the full rollout. This minimizes user impact by limiting exposure to potentially faulty code, while still catching issues earlier than a one-at-a-time deployment. The 'CodeDeployDefault.OneAtATime' configuration already deploys to one instance at a time, but a canary reduces the blast radius further by routing only a fraction of traffic to the new instances.

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.

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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