PCNE Practice Question: Managing, Monitoring, and Optimising Network Operations
A company has enabled VPC Flow Logs on a subnet with the default sample rate. They notice that only 50% of flows are being logged. What is the most likely reason?
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 sample rate is set to 50% by default
The default sampling rate for VPC Flow Logs is 50%. This means only half of the network flows are captured to reduce cost and volume.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Flow logs only capture TCP traffic
Why it's wrong here
Flow logs capture UDP, TCP, and other protocols.
- ✓
The sample rate is set to 50% by default
Why this is correct
Correct: The default sampling rate is 50%.
- ✗
Flow logs are disabled by default on all subnets
Why it's wrong here
They are enabled, but default sampling rate is 50%.
- ✗
The subnet is using a custom sample rate of 50%
Why it's wrong here
Default is 50%.
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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.