PCNE Configuring Network Services Practice Question
A company uses Traffic Director with Envoy proxies to manage east-west traffic. They want to implement fault injection to test the resilience of their service mesh. Which TWO types of faults can they inject? (Choose two.)
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
✓
Delay (add a fixed latency to matching requests)
Traffic Director supports fault injection for abort (return an HTTP error) and delay (add latency). Throttle is not a supported fault injection type in Traffic Director; it is a rate-limiting feature that is not part of fault injection. Retry and Timeout are routing or circuit breaker features, not fault injection. Therefore, the two correct answers are abort (C) and delay (A).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Delay (add a fixed latency to matching requests)
Why this is correct
Delay adds a fixed latency to matching requests. This is a supported fault injection type in Traffic Director.
- ✗
Throttle (limit the rate of requests)
Why it's wrong here
Throttle limits the rate of requests. However, Traffic Director does not support throttle as a fault injection type. It is a separate rate-limiting feature.
- ✓
Abort (return a specified HTTP status code)
Why this is correct
Abort returns a specified HTTP status code. This is a supported fault injection type in Traffic Director.
- ✗
Retry (automatically retry failed requests)
Why it's wrong here
Retry automatically retries failed requests. This is a routing feature, not a fault injection type in Traffic Director.
- ✗
Timeout (set a maximum time for a request to complete)
Why it's wrong here
Timeout sets a maximum time for a request to complete. This is a circuit breaker setting, not a fault injection type in Traffic Director.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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