ANS-C01 Network Design Practice Question
A company has a VPC with multiple subnets. They want to capture and analyze network traffic between EC2 instances in the same VPC for troubleshooting. Which AWS service should be used?
⚠ Common exam trap
Watch out — candidates often confuse VPC Flow Logs with CloudTrail, thinking CloudTrail captures network traffic because it logs 'events,' but CloudTrail only logs AWS API calls, not the data-plane traffic between instances.
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 metadata (source/destination IP, ports, protocol, packet/byte counts) at the VPC, subnet, or network interface level, enabling detailed analysis of traffic between EC2 instances within the same VPC. This is the correct service because it provides the network-level visibility needed for troubleshooting traffic flows without requiring agents or changes to the instances.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VPC Flow Logs
Why this is correct
Captures network traffic metadata for analysis.
- ✗
AWS CloudTrail
Why it's wrong here
Captures API activity, not network traffic.
- ✗
AWS Config
Why it's wrong here
Tracks resource configuration changes.
- ✗
Amazon CloudWatch Metrics
Why it's wrong here
Monitors performance metrics, not network packets.
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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.