Question 55 of 505

Software Development and Design →hardMultiple ChoiceObjective-mapped

200-901 Software Development and Design Practice Question

This 200-901 practice question tests your understanding of software development and design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is developing a CI/CD pipeline for a microservices application that uses Cisco NSO (Network Services Orchestrator) for network configuration. The application code is stored in a Git repository. The pipeline must automatically trigger a test suite when a pull request is merged to the main branch, but only if the tests pass, then deploy to a staging environment. The team is using Jenkins. A junior engineer suggests using a single Jenkinsfile with a declarative pipeline that includes all stages. However, a senior engineer notes that the pipeline should be designed for reusability and maintainability, especially as the number of microservices grows. Which approach best meets these requirements?

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.

Question 1hardmultiple choice

Full question →

A
Use shared libraries to define common stages like testing and deployment, and reference them in each microservice's Jenkinsfile.
C is correct because shared libraries encapsulate reusable pipeline code, minimising duplication and simplifying updates across all microservices.
B
Create separate Jenkinsfiles for each microservice and call them from a main pipeline using the "build" step.
Why wrong: B is incorrect because although it modularises, each Jenkinsfile still contains duplicate logic for common stages like testing and deployment, reducing maintainability.
C
Use a single scripted pipeline that uses "parallel" for microservices and "stage" for testing and deployment.
Why wrong: D is incorrect because while it may work initially, the pipeline is monolithic and does not facilitate reuse or easy maintenance as the number of services grows.
D
Use a single declarative pipeline with all stages defined in the Jenkinsfile and use "when" conditions to control execution.
Why wrong: A is incorrect because a single pipeline with conditions becomes unwieldy as microservices increase, and lacks reusability across different services.

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 shared libraries to define common stages like testing and deployment, and reference them in each microservice's Jenkinsfile.

The correct answer is C: Use shared libraries to define common stages like testing and deployment, and reference them in each microservice's Jenkinsfile. Shared libraries reduce duplication and centralise logic, making it easy to update common steps across all services. A (single pipeline with conditions) leads to code duplication as new services are added. B (separate Jenkinsfiles called from a main pipeline) is better than A but still duplicates common logic across files unless shared libraries are used. D (scripted pipeline with parallel) does not inherently promote reuse; it may combine steps but still duplicates if not abstracted.

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.

✓
Use shared libraries to define common stages like testing and deployment, and reference them in each microservice's Jenkinsfile.
Why this is correct
C is correct because shared libraries encapsulate reusable pipeline code, minimising duplication and simplifying updates across all microservices.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create separate Jenkinsfiles for each microservice and call them from a main pipeline using the "build" step.
Why it's wrong here
B is incorrect because although it modularises, each Jenkinsfile still contains duplicate logic for common stages like testing and deployment, reducing maintainability.
✗
Use a single scripted pipeline that uses "parallel" for microservices and "stage" for testing and deployment.
Why it's wrong here
D is incorrect because while it may work initially, the pipeline is monolithic and does not facilitate reuse or easy maintenance as the number of services grows.
✗
Use a single declarative pipeline with all stages defined in the Jenkinsfile and use "when" conditions to control execution.
Why it's wrong here
A is incorrect because a single pipeline with conditions becomes unwieldy as microservices increase, and lacks reusability across different services.

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 practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which 200-901 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 200-901 question test?

Software Development and Design — This question tests Software Development and Design — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use shared libraries to define common stages like testing and deployment, and reference them in each microservice's Jenkinsfile. — The correct answer is C: Use shared libraries to define common stages like testing and deployment, and reference them in each microservice's Jenkinsfile. Shared libraries reduce duplication and centralise logic, making it easy to update common steps across all services. A (single pipeline with conditions) leads to code duplication as new services are added. B (separate Jenkinsfiles called from a main pipeline) is better than A but still duplicates common logic across files unless shared libraries are used. D (scripted pipeline with parallel) does not inherently promote reuse; it may combine steps but still duplicates if not abstracted.

What should I do if I get this 200-901 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?

Read the scenario before looking for a memorised answer.

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