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200-901 Practice Question: Which THREE of the following are common design…
Which THREE of the following are common design patterns for microservices? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between general software design patterns (like Singleton or Chain of Responsibility) and patterns specifically designed for microservices architecture, such as Circuit Breaker, Service Registry, and API Gateway.
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
✓
Circuit Breaker
The Circuit Breaker pattern (B) is a common microservices design pattern that prevents cascading failures by monitoring for failures and opening a circuit to stop requests to a failing service, allowing it to recover. It is widely implemented in frameworks like Netflix Hystrix or Resilience4j, where states (closed, open, half-open) control request flow and timeout thresholds.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Chain of Responsibility
Why it's wrong here
Incorrect: This is a behavioral pattern, not specific to microservices.
- ✓
Circuit Breaker
Why this is correct
Correct: Circuit Breaker is used for fault tolerance.
- ✗
Singleton
Why it's wrong here
Incorrect: Singleton is a general OOP pattern.
- ✓
Service Registry
Why this is correct
Correct: Service Registry is used for service discovery.
- ✓
API Gateway
Why this is correct
Correct: API Gateway is a common microservices pattern.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.