PCNE Configuring Network Services Practice Question
An engineer configures a Global HTTPS Load Balancer with a backend service pointing to an instance group. The health check is set to HTTP on port 80, check interval 5s, timeout 5s, healthy threshold 1, unhealthy threshold 1. After deployment, instances are marked unhealthy despite the application responding correctly on port 80. What is the most likely cause?
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
✓
The health check timeout is equal to the check interval
With timeout equal to check interval, the health check may not have enough time to complete before the next check starts, causing failures. The timeout should be less than the interval.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The health check is using HTTPS but the instance expects HTTP
Why it's wrong here
The question states HTTP health check.
- ✗
The unhealthy threshold is set too high
Why it's wrong here
Unhealthy threshold of 1 is low, which would mark unhealthy quickly.
- ✗
The health check is not configured with a host header
Why it's wrong here
Missing host header might cause 404 but not necessarily timeout issues.
- ✓
The health check timeout is equal to the check interval
Why this is correct
Timeout (5s) equals interval (5s); timeout must be less than interval.
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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.