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200-901 Practice Question: Which design principle suggests that a module…
Which design principle suggests that a module should be responsible for a single part of the functionality?
⚠ Common exam trap
Cisco often tests the distinction between Separation of Concerns and DRY, as candidates may confuse 'not repeating code' with 'assigning single responsibility' — the trap is that DRY is about code reuse, not module focus.
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
✓
Separation of Concerns
Separation of Concerns (SoC) is the design principle that dictates each module or component should focus on a single, well-defined part of the functionality. In software development, this reduces coupling and increases cohesion, making code easier to maintain, test, and refactor. For example, in a Python Flask web application, separating route handling, business logic, and database access into distinct modules follows SoC.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Separation of Concerns
Why this is correct
This principle dictates that each module should handle a distinct aspect of the application's functionality.
- ✗
YAGNI (You Aren't Gonna Need It)
Why it's wrong here
YAGNI discourages adding functionality until it is needed, not about module responsibility.
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DRY (Don't Repeat Yourself)
Why it's wrong here
DRY aims to avoid duplication of code, not necessarily single responsibility per module.
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KISS (Keep It Simple, Stupid)
Why it's wrong here
KISS promotes simplicity in design, but not specifically single responsibility.
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