PCDOE Implementing service monitoring strategies Practice Question
Network Topology
A DevOps engineer runs the command above and gets the output shown. What does this output indicate?
⚠ Common exam trap
A common mix-up: candidates confuse application-level connection timeouts with infrastructure-level issues like disk full or health check failures, but the specific 'Connection timed out' message directly points to a network connectivity problem to a backend service.
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
✓
An application running on the instance encountered a connection timeout to a backend service.
The output shows a 'Connection timed out' error when attempting to reach a backend service. This indicates that the application on the instance is unable to establish a TCP connection to the specified IP and port, typically due to network issues, firewall rules, or the backend service being down. The error is specific to application-level connectivity, not disk space or authentication.
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 instance's disk is full, causing write errors.
Why it's wrong here
No disk-related message is present.
- ✓
An application running on the instance encountered a connection timeout to a backend service.
Why this is correct
The log message explicitly states 'Connection timeout to backend service'.
- ✗
The instance failed to authenticate with the metadata server.
Why it's wrong here
The log shows a connection timeout, not an authentication failure.
- ✗
A health check probe failed to reach the instance.
Why it's wrong here
Health check failures are logged in load balancer logs, not as instance logs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCDOE 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 PCDOE exam.