350-501 Automation and Quality of Services Practice Question
In the context of YANG modeling for network automation, which statement about 'must' expressions is true?
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
✓
They enforce a constraint that must be true for the data to be valid.
'must' is an XPath expression that enforces a constraint on the data; if the condition is false, validation fails.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
They conditionally make a leaf mandatory.
Why it's wrong here
'mandatory' statement or 'when' does that.
- ✗
They are used to refine types.
Why it's wrong here
Refinements are done with 'type' statement.
- ✗
They are used to define default values.
Why it's wrong here
Default values are defined with 'default' statement.
- ✓
They enforce a constraint that must be true for the data to be valid.
Why this is correct
'must' specifies an XPath expression that must evaluate to true.
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