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200-901 Practice Question: Which THREE of the following are constraints of…
Which THREE of the following are constraints of the REST architectural style (as defined by Roy Fielding)?
⚠ Common exam trap
Cisco often tests the distinction between mandatory and optional constraints of REST, so candidates may incorrectly include code-on-demand as a required constraint or assume that server-side session management is allowed under statelessness.
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
✓
Client-server architecture
The client-server constraint is a fundamental principle of REST, as defined by Roy Fielding in his doctoral dissertation. It separates the user interface concerns from data storage concerns, improving portability across multiple platforms and scalability by simplifying server components. This separation allows each side to evolve independently, which is a core architectural benefit.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Client-server architecture
Why this is correct
Client-server is a fundamental REST constraint separating concerns between user interface and data storage.
- ✓
Layered system
Why this is correct
A layered system allows intermediaries (proxies, gateways) to be inserted without affecting the client or server.
- ✗
Session management on the server
Why it's wrong here
REST requires statelessness, which forbids server-side session state.
- ✗
Code-on-demand
Why it's wrong here
Code-on-demand is an optional constraint and not mandatory for a RESTful system.
- ✓
Statelessness
Why this is correct
Each request from a client must contain all the information needed to understand it; session state is kept on the client.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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