ANS-C01 Network Design Practice Question
A company has a VPC with multiple subnets. They want to monitor all network traffic to and from an EC2 instance for troubleshooting. Which AWS service should they use?
⚠ Common exam trap
Many exam-takers confuse VPC Flow Logs (which capture network traffic metadata) with AWS CloudTrail (which captures API calls), leading them to incorrectly select CloudTrail when the question specifically asks about monitoring network traffic to and from an EC2 instance.
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
✓
VPC Flow Logs
VPC Flow Logs capture IP traffic information for network interfaces in a VPC, including metadata such as source/destination IPs, ports, protocols, and packet accept/reject decisions. This makes it the correct service for monitoring all network traffic to and from an EC2 instance for troubleshooting purposes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Inspector
Why it's wrong here
Inspector is for vulnerability management, not traffic monitoring.
- ✗
AWS Config
Why it's wrong here
Config tracks resource configuration changes, not network traffic.
- ✓
VPC Flow Logs
Why this is correct
VPC Flow Logs capture information about IP traffic going to and from network interfaces in a VPC.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail logs API activity, not network traffic.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services 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 ANS-C01 exam.