KCNA Cloud Native Architecture Practice Question
In the context of resiliency patterns, which pattern is designed to prevent a cascade of failures by isolating each component so that a failure in one component does not affect others?
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
✓
Bulkhead
The bulkhead pattern isolates resources (e.g., thread pools, connections) so that a failure in one part of the system doesn't bring down other parts. Circuit breaker is for handling failures of external calls, not isolation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Retry
Why it's wrong here
Retry re-invokes a failed operation, which increases load on an already struggling dependency and can amplify the cascade rather than isolate components. It is genuinely useful for transient network blips, where a bounded number of retries with backoff recovers a call that failed momentarily.
- ✗
Circuit breaker
Why it's wrong here
A circuit breaker stops calls to a failing dependency once a threshold trips, but it does not isolate components from one another. It is tempting because it prevents cascading failures, and it would be correct when the goal is failing fast against an unhealthy downstream service rather than containing blast radius.
- ✗
Timeout
Why it's wrong here
Timeout bounds how long a caller waits for a response, freeing the thread but not isolating the failing component; repeated timeouts still propagate load. It is the right choice when a slow dependency must not block callers indefinitely, capping latency rather than containing failure.
- ✓
Bulkhead
Why this is correct
The Bulkhead pattern partitions components into isolated pools, so resource exhaustion or failure in one partition cannot consume shared capacity and cascade to others. This isolation directly satisfies the requirement to contain failures within individual components.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA practice question is part of Courseiva's free CNCF 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 KCNA exam.