AZ-400 Practice Question: Design and implement build and release pipelines
This AZ-400 practice question tests your understanding of design and implement build and release pipelines. 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.
Network Topology
Refer to the exhibit. You have an Azure Pipelines YAML file for a .NET Core application. The pipeline is triggered on changes to the main branch, but only for files under src/. After a push to main that modifies a file in src/, the pipeline does not start. What is the most likely reason?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The path filter 'src/*' does not match files in subdirectories of src/.
Option B is correct because the trigger has a path filter with include but no exclude, which is correct, but the indentation of 'paths' is wrong (it should be at the same level as 'branch')? Actually the exhibit shows correct indentation. Another common issue: The trigger definition is inside an array, but the YAML might be parsed incorrectly. Actually the root cause is that the pipeline is defined as a multi-stage YAML but the trigger is configured at the top level; however, the exhibit shows the trigger correctly. The real issue: The trigger path filter 'include' pattern 'src/*' does not recursively match files in subdirectories. Azure Pipelines path filters require '**' for recursive matches. So the pipeline does not trigger because 'src/*' only matches files directly in src/, not in subfolders. Option A is wrong because the syntax is valid. Option C is wrong because the branch is main. Option D is wrong because the build configuration variable does not affect triggers.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 branch filter is missing the 'refs/heads/' prefix.
Why it's wrong here
Branch names without prefix work in triggers.
✗
The trigger configuration has a syntax error: 'include' should be 'includes'.
Why it's wrong here
'include' is correct in Azure Pipelines YAML.
✗
The variable 'buildConfiguration' is not defined at the top level.
Why it's wrong here
Variables are defined correctly.
✓
The path filter 'src/*' does not match files in subdirectories of src/.
Why this is correct
Azure Pipelines path filters require '**' for recursive matching.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-400 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-400 NAT questions on configuration and troubleshooting.
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The path filter 'src/*' does not match files in subdirectories of src/. — Option B is correct because the trigger has a path filter with include but no exclude, which is correct, but the indentation of 'paths' is wrong (it should be at the same level as 'branch')? Actually the exhibit shows correct indentation. Another common issue: The trigger definition is inside an array, but the YAML might be parsed incorrectly. Actually the root cause is that the pipeline is defined as a multi-stage YAML but the trigger is configured at the top level; however, the exhibit shows the trigger correctly. The real issue: The trigger path filter 'include' pattern 'src/*' does not recursively match files in subdirectories. Azure Pipelines path filters require '**' for recursive matches. So the pipeline does not trigger because 'src/*' only matches files directly in src/, not in subfolders. Option A is wrong because the syntax is valid. Option C is wrong because the branch is main. Option D is wrong because the build configuration variable does not affect triggers.
What should I do if I get this AZ-400 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-400 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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