SALESFORCE-PD1 User Interface Practice Question
A developer is implementing communication in Lightning Web Components. Which TWO mechanisms are valid for passing data or messages between components? (Choose TWO)
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
✓
Dispatching and listening to CustomEvent instances in parent-child hierarchies.
Custom events (child to parent) and Lightning Message Service (unrelated components) are standard mechanisms.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Directly assigning properties on child components from sibling components.
Why it's wrong here
Incorrect because sibling components cannot directly access each other's properties.
- ✓
Dispatching and listening to CustomEvent instances in parent-child hierarchies.
Why this is correct
Correct because CustomEvent is standard for child-to-parent communication.
- ✗
Using application events via $A.get('e.force:event') in LWC.
Why it's wrong here
Incorrect because Aura application events cannot be used natively in LWC.
- ✗
Modifying global window variables shared across component scopes.
Why it's wrong here
Incorrect because modifying window variables is an anti-pattern.
- ✓
Using Lightning Message Service (LMS) to publish and subscribe across the DOM.
Why this is correct
Correct because LMS bridges communication across arbitrary component relationships.
About these practice questions
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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