200-901 Software Development and Design Practice Question
This 200-901 practice question tests your understanding of software development and design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO statements about REST API design best practices are true? (Choose two.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use nouns for resource endpoints, e.g., /devices instead of /getDevices
Option D is correct because RESTful APIs use nouns to represent resources (e.g., /devices) rather than verbs (e.g., /getDevices). This aligns with the uniform interface constraint of REST, where the HTTP method (GET, POST, etc.) defines the action, and the URI identifies the resource. Using nouns keeps the API intuitive, consistent, and scalable.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Avoid API versioning to keep the API simple
Why it's wrong here
Incorrect: Versioning is important for evolution.
✗
Include the HTTP method in the URI path, e.g., /getDevices
Why it's wrong here
Incorrect: The HTTP method should be used via the verb, not the path.
✗
Always use file-based transfer for large payloads
Why it's wrong here
Incorrect: REST can handle large payloads via streaming or chunking.
✓
Use nouns for resource endpoints, e.g., /devices instead of /getDevices
Why this is correct
Correct: Nouns represent resources.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use HTTP methods appropriately: GET for retrieval, POST for creation, etc.
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that verbs in URIs (like /getDevices) are acceptable, when in fact REST mandates nouns for resources and HTTP methods for actions, and that avoiding versioning is a shortcut that breaks backward compatibility.
Detailed technical explanation
How to think about this question
REST relies on the uniform interface constraint, where each resource is identified by a URI (e.g., /devices/{id}) and manipulated via standard HTTP methods (GET, POST, PUT, DELETE). Under the hood, this decouples the client from the server's internal logic, enabling caching, idempotency, and stateless interactions. In real-world scenarios, using nouns and proper HTTP methods simplifies API documentation, tooling (e.g., OpenAPI/Swagger), and client code generation, while versioning (e.g., via URI path /v1/devices or headers) ensures smooth evolution.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Software Development and Design — This question tests Software Development and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use nouns for resource endpoints, e.g., /devices instead of /getDevices — Option D is correct because RESTful APIs use nouns to represent resources (e.g., /devices) rather than verbs (e.g., /getDevices). This aligns with the uniform interface constraint of REST, where the HTTP method (GET, POST, etc.) defines the action, and the URI identifies the resource. Using nouns keeps the API intuitive, consistent, and scalable.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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