PCNE Configuring Network Services Practice Question
A network engineer is troubleshooting a global HTTPS load balancer that is not serving traffic to some users. The load balancer has a backend service with a zonal NEG in us-central1-a. Users report intermittent 502 errors. Which two checks should the engineer perform? (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
✓
Verify that the health check for the backend service is passing
Common causes for 502 errors include health check failures and mismatched SSL certificates. Check that the health check passes and that the SSL certificate covers the domain.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Verify that the health check for the backend service is passing
Why this is correct
Unhealthy backends cause 502 errors.
- ✗
Increase the size of the instance group
Why it's wrong here
Size affects capacity, not 502 errors directly.
- ✗
Disable HTTP/2 on the backend
Why it's wrong here
HTTP/2 is not likely the cause of 502 errors.
- ✗
Ensure Cloud CDN is enabled
Why it's wrong here
CDN is optional, not causing 502.
- ✓
Check that the SSL certificate matches the domain name
Why this is correct
Mismatched certificates can cause SSL handshake failures and 502s.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.