SOA-C02 Networking and Content Delivery Practice Question
A SysOps administrator needs to monitor network traffic to and from an EC2 instance for troubleshooting. Which AWS feature captures IP traffic information at the VPC level?
⚠ Common exam trap
Watch out — candidates often confuse VPC Flow Logs with CloudWatch Logs or CloudTrail, mistakenly thinking that CloudTrail captures network traffic or that CloudWatch Logs is the primary service for network monitoring, when in fact VPC Flow Logs are the dedicated feature for IP traffic capture at the VPC level.
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 within a VPC, including source/destination IPs, ports, protocols, and packet accept/reject decisions. This feature operates at the VPC level and is specifically designed for network traffic monitoring and troubleshooting, making it the correct choice for capturing IP traffic information to and from an EC2 instance.
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
VPC Flow Logs capture IP traffic metadata at the elastic network interface level, including source/destination IP addresses, ports, protocol, and action (accept or reject) for each packet. This data is published to Amazon CloudWatch Logs or Amazon S3, enabling administrators to monitor traffic patterns, troubleshoot connectivity issues, and analyze security groups or network ACL behavior. Unlike logging services, VPC Flow Logs are the native AWS mechanism specifically for network traffic monitoring.
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Amazon CloudWatch Logs
Why it's wrong here
Amazon CloudWatch Logs is a centralized log storage and monitoring service that ingests, stores, and surfaces log data from sources such as applications, EC2 instances, or other AWS services. It does not independently capture network traffic; it only receives data that is explicitly sent to it, such as VPC Flow Logs. In this context, CloudWatch Logs could serve as a destination for VPC Flow Logs, but it is not the tool that monitors or captures the traffic itself.
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AWS CloudTrail
Why it's wrong here
AWS CloudTrail records API activity across your AWS account, providing an audit trail of management events (and optionally data events) like CreateBucket, RunInstances, or console sign-in operations. It monitors who made which API calls, from which IP address, and when, but it does not capture raw network packets or IP traffic flowing between resources. CloudTrail is a governance and compliance tool, not a network traffic monitoring solution.
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AWS Config
Why it's wrong here
AWS Config evaluates your AWS resource configurations against desired policies and records configuration changes as configuration items. It offers a history of resource settings, compliance status, and relationships between resources, but it has no visibility into the actual data packets traversing your VPC. AWS Config is designed to answer 'what is my resource's state?' rather than 'what network traffic is occurring?' Therefore, it is unsuitable for network traffic monitoring.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SOA-C02 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 SOA-C02 exam.