PCNE Configuring Network Services Practice Question
A company is using Traffic Director with Envoy sidecar proxies to manage traffic between microservices. They want to gradually shift 5% of traffic from version v1 to v2 of a service for testing. Which Traffic Director resource should they configure?
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
✓
Define a weighted traffic split in the HTTP route rule of the Traffic Director route configuration
Traffic Director supports traffic splitting via weighted routing in the HTTP route configuration, not in the backend service. The traffic splitting is done at the routing level.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Define a weighted traffic split in the HTTP route rule of the Traffic Director route configuration
Why this is correct
Traffic Director uses route rules with weighted clusters to split traffic.
- ✗
Use the Envoy runtime to dynamically adjust traffic percentages
Why it's wrong here
While Envoy supports runtime, Traffic Director manages this via xDS; direct runtime changes are not the intended method.
- ✗
Create a new backend service for v2 and set the traffic split in the backend service
Why it's wrong here
Backend services do not have traffic split settings; splitting is done in route rules.
- ✗
Configure a weighted round-robin routing policy in Cloud DNS
Why it's wrong here
Cloud DNS is for DNS resolution, not for L7 traffic splitting between service versions.
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Senior Network & Security Engineer · founder of Courseiva
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