- A
Bulkhead
Why wrong: Bulkhead isolates resources to prevent cascading failures.
- B
Circuit breaker
Why wrong: Circuit breaker prevents repeated calls when a service is down, but retry is for transient faults.
- C
Timeout
Why wrong: Timeout sets a limit on wait time, but does not retry.
- D
Retry
Retry handles transient failures by reattempting the operation.
Question 523 of 997
Retry Pattern — Handling Transient Faults | Kubernetes and Cloud Native Associate Explained
This KCNA practice question tests your understanding of cloud native architecture. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An application experiences intermittent failures when calling an external API. Which resilience pattern should be implemented to handle transient faults?
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
✓
Retry
Option D (Retry) is correct because intermittent failures when calling an external API are typically transient faults (e.g., network glitches, temporary service unavailability). The Retry pattern automatically reattempts the failed operation a configured number of times, often with exponential backoff, to overcome these short-lived issues without changing the application's overall architecture. This directly addresses the scenario's requirement to handle transient faults.
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.
- ✗
Bulkhead
Why it's wrong here
Bulkhead isolates resources to prevent cascading failures.
- ✗
Circuit breaker
Why it's wrong here
Circuit breaker prevents repeated calls when a service is down, but retry is for transient faults.
- ✗
Timeout
Why it's wrong here
Timeout sets a limit on wait time, but does not retry.
- ✓
Retry
Why this is correct
Retry handles transient failures by reattempting the operation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between handling transient faults (Retry) versus preventing cascading failures (Circuit breaker), leading candidates to choose Circuit breaker when the question explicitly mentions 'intermittent' or 'transient' faults.
Detailed technical explanation
How to think about this question
The Retry pattern typically uses exponential backoff (e.g., initial delay of 100ms, doubling each retry) to avoid overwhelming the external API, often combined with jitter to prevent thundering herd problems. In Kubernetes environments, this can be implemented via client libraries (e.g., Istio's retry configuration in VirtualService) or application-level logic. A real-world scenario: an API call fails due to a temporary DNS resolution delay; a retry with a 500ms backoff succeeds on the second attempt, whereas a circuit breaker would incorrectly open and block all traffic for minutes.
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 practitioner preparing for the KCNA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
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Cloud Native Architecture — study guide chapter
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FAQ
Questions learners often ask
What does this KCNA question test?
Cloud Native Architecture — This question tests Cloud Native Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Retry — Option D (Retry) is correct because intermittent failures when calling an external API are typically transient faults (e.g., network glitches, temporary service unavailability). The Retry pattern automatically reattempts the failed operation a configured number of times, often with exponential backoff, to overcome these short-lived issues without changing the application's overall architecture. This directly addresses the scenario's requirement to handle transient faults.
What should I do if I get this KCNA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 30, 2026
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.
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