PCNE Configuring Network Services Practice Question
An organization uses Traffic Director with Envoy sidecars in GKE. They want to implement fault injection to test service resilience by injecting a 5-second delay into 10% of requests to a specific backend service. Which Traffic Director configuration resource should they use?
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
✓
A fault injection policy in the TrafficDirectorRoute
Traffic Director supports fault injection via the Envoy HTTP connection manager. The correct approach is to configure a TrafficDirectorRoute with a fault injection policy, which is part of the routing configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A backend service with outlier detection enabled
Why it's wrong here
Outlier detection evicts unhealthy hosts, not fault injection.
- ✗
A network endpoint group with a health check that fails intermittently
Why it's wrong here
Health checks do not inject delays; they mark instances unhealthy.
- ✗
A traffic splitting rule in the routing configuration
Why it's wrong here
Traffic splitting distributes traffic percentage, not fault injection.
- ✓
A fault injection policy in the TrafficDirectorRoute
Why this is correct
Correct: Traffic Director allows fault injection via route rules in the routing configuration.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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