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Question 180 of 500

Building and testing applications →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the canary percentages for the prod target do not sum to 100, which causes the Cloud Deploy pipeline to fail. In Google Cloud Deploy, the canary rollout strategy requires the percentage increments defined for a target to add up exactly to 100, because each value represents a sequential traffic shift ending with full deployment. In the exhibit, the prod stage lists 10, 20, and 60, which sum to only 90, and the final 100 is not an incremental step but the final full rollout—so the increments themselves must total 100. On the Google Professional Cloud Developer exam, this tests your understanding of how Cloud Deploy validates pipeline configurations, and a common trap is mistaking the final 100 as part of the incremental sum. Remember: the increments are the steps before the final 100, and they must always sum to 100—think of it as “the steps to the top must fill the staircase.”

PCD Building and testing applications Practice Question

This PCD practice question tests your understanding of building and testing applications. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.

Exhibit

apiVersion: deploy.cloud.google.com/v1
kind: DeliveryPipeline
metadata:
  name: my-pipeline
  location: us-central1
serialPipeline:
  stages:
  - targetId: dev
    strategy:
      canary:
        canaryDeployment:
          percentages: [25, 50, 75, 100]
  - targetId: prod
    strategy:
      canary:
        canaryDeployment:
          percentages: [10, 20, 60, 100]

Refer to the exhibit. The developer receives an error when creating the delivery pipeline. What is the most likely cause?

Clue words in this question

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

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1mediummultiple choice

Full question →

Exhibit

apiVersion: deploy.cloud.google.com/v1
kind: DeliveryPipeline
metadata:
  name: my-pipeline
  location: us-central1
serialPipeline:
  stages:
  - targetId: dev
    strategy:
      canary:
        canaryDeployment:
          percentages: [25, 50, 75, 100]
  - targetId: prod
    strategy:
      canary:
        canaryDeployment:
          percentages: [10, 20, 60, 100]

A
The prod target is missing a verification step.
Why wrong: Verification steps are optional for pipeline creation.
B
The dev target has four percentages, but only two are allowed.
Why wrong: Cloud Deploy allows multiple percentages for canary deployment.
C
The canary percentages for the prod target do not sum to 100.
The increments should sum to 100; here they sum to 90, causing validation error.
D
The pipeline name is too long.
Why wrong: Cloud Deploy allows long names.

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

✓

The canary percentages for the prod target do not sum to 100.

Option C is correct because the sum of the percentages in the prod stage is 10+20+60=90, and the last value 100 is not an increment but the final full rollout. The increments must sum to 100. Option A is incorrect because four percentages are allowed. Option B is not a requirement for pipeline creation. Option D is unlikely.

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.

✗
The prod target is missing a verification step.
Why it's wrong here
Verification steps are optional for pipeline creation.
✗
The dev target has four percentages, but only two are allowed.
Why it's wrong here
Cloud Deploy allows multiple percentages for canary deployment.
✓
The canary percentages for the prod target do not sum to 100.
Why this is correct
The increments should sum to 100; here they sum to 90, causing validation error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pipeline name is too long.
Why it's wrong here
Cloud Deploy allows long names.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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.

What to study next

Got this wrong? Here's your next step.

Identify which PCD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this PCD question test?

Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The canary percentages for the prod target do not sum to 100. — Option C is correct because the sum of the percentages in the prod stage is 10+20+60=90, and the last value 100 is not an increment but the final full rollout. The increments must sum to 100. Option A is incorrect because four percentages are allowed. Option B is not a requirement for pipeline creation. Option D is unlikely.

What should I do if I get this PCD question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 24, 2026

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This PCD practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCD exam.