200-901 Software Development and Design Practice Question
This 200-901 practice question tests your understanding of software development and design. 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.
A team uses Git for source control. They want to ensure that all code committed to the main branch passes unit tests and linting. Which Git workflow practice best ensures 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using pre-commit hooks and CI pipeline to block failing commits
Using pre-commit hooks and a CI pipeline that blocks commits if tests fail is the most reliable way. Option A (feature branching with manual merge) does not enforce tests. Option B (GitFlow with hotfix branches) is about branching models, not enforcement. Option C (trunk-based development with feature toggles) allows incomplete code but does not guarantee passing tests on merge.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Using pre-commit hooks and CI pipeline to block failing commits
Why this is correct
Pre-commit hooks run tests locally before commit, and CI blocks merges that fail tests.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
✗
Trunk-based development with feature toggles
Why it's wrong here
Feature toggles allow incomplete code in the main branch, but tests may still fail.
✗
Feature branching with manual merge
Why it's wrong here
Manual merge does not automatically run tests; it relies on the developer to test.
✗
GitFlow with hotfix branches
Why it's wrong here
GitFlow is a branching strategy but does not automatically enforce test passing.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-901 questions on switching, trunking, and access-port configuration.
Software Development and Design — This question tests Software Development and Design — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Using pre-commit hooks and CI pipeline to block failing commits — Using pre-commit hooks and a CI pipeline that blocks commits if tests fail is the most reliable way. Option A (feature branching with manual merge) does not enforce tests. Option B (GitFlow with hotfix branches) is about branching models, not enforcement. Option C (trunk-based development with feature toggles) allows incomplete code but does not guarantee passing tests on merge.
What should I do if I get this 200-901 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-901 questions on switching, trunking, and access-port configuration.
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?
Access ports place end devices into a single VLAN.
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