PCNE Configuring Network Services Practice Question

You need to migrate traffic gradually from an old version of a microservice to a new version using Traffic Director. You want to send 10% of traffic to the new version and 90% to the old version. Which configuration should you use?

Answer choices

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Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Configure a weighted destination rule in the Envoy route with weights 9:1.

Traffic Director supports traffic splitting via weighted destination rules in the Envoy configuration. The correct approach is to specify weights for each service version in the route rule. Setting circuit breaker thresholds or using connection draining does not achieve traffic splitting.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Configure a weighted destination rule in the Envoy route with weights 9:1.
Why this is correct
Traffic splitting is done via weighted destination rules in Envoy.
✗
Create two separate backend services and use a URL map to distribute traffic.
Why it's wrong here
URL maps are for path-based routing, not percentage-based splitting within the same service.
✗
Set circuit breaker thresholds to limit connections to the new version.
Why it's wrong here
Circuit breakers limit connections but do not split traffic.
✗
Use a health check to gradually remove the old version instances.
Why it's wrong here
Health checks are for instance health, not traffic splitting.

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PCNE Configuring Network Services Practice Question

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