- A
Create a weighted backend service with versionA weight 90 and versionB weight 10
Correct. Traffic Director supports weighted routing.
- B
Use HTTP load balancer URL map to route 10% of requests
Why wrong: URL map is for URL-based routing, not traffic splitting by percentage.
- C
Configure a firewall rule to drop 10% of traffic to versionA
Why wrong: Firewall rules do not perform traffic splitting.
- D
Deploy versionB in a different region and use geo-routing
Why wrong: Geo-routing routes based on location, not percentages.
Question 644 of 982
PCNE Configuring Network Services Practice Question
This PCNE practice question tests your understanding of configuring network services. 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 engineer wants to use Traffic Director to split traffic between two versions of a microservice running on Compute Engine with Envoy sidecars. They want to send 10% of traffic to the new version. Which configuration should they apply?
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
✓
Create a weighted backend service with versionA weight 90 and versionB weight 10
Traffic Director uses traffic splitting rules with weight percentages. The backend service or routing rule allows assigning weights to different versions.
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.
- ✓
Create a weighted backend service with versionA weight 90 and versionB weight 10
Why this is correct
Correct. Traffic Director supports weighted routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use HTTP load balancer URL map to route 10% of requests
Why it's wrong here
URL map is for URL-based routing, not traffic splitting by percentage.
- ✗
Configure a firewall rule to drop 10% of traffic to versionA
Why it's wrong here
Firewall rules do not perform traffic splitting.
- ✗
Deploy versionB in a different region and use geo-routing
Why it's wrong here
Geo-routing routes based on location, not percentages.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which PCNE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Configuring Network Services — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Configuring Network Services — This question tests Configuring Network Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a weighted backend service with versionA weight 90 and versionB weight 10 — Traffic Director uses traffic splitting rules with weight percentages. The backend service or routing rule allows assigning weights to different versions.
What should I do if I get this PCNE question wrong?
Identify which PCNE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This PCNE practice question is part of Courseiva's free Google Cloud 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 PCNE exam.
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