SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which AWS service can be used to detect and alert on suspicious network traffic patterns within a VPC, such as port scanning or unusual outbound traffic?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon GuardDuty
Amazon GuardDuty is a threat detection service that continuously monitors VPC Flow Logs, DNS logs, and CloudTrail events to identify suspicious network traffic patterns such as port scanning, unusual outbound traffic, and other malicious activities. It uses machine learning, anomaly detection, and integrated threat intelligence to generate security alerts without requiring manual rules or signatures.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
AWS WAF
Why it's wrong here
WAF protects web applications from common exploits, not network-level detection.
✓
Amazon GuardDuty
Why this is correct
GuardDuty uses machine learning and threat intelligence to detect suspicious network activity.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Network Firewall
Why it's wrong here
Network Firewall is for filtering traffic, not detecting patterns like port scanning.
✗
VPC Flow Logs
Why it's wrong here
VPC Flow Logs only record network traffic; they don't analyze for threats.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse VPC Flow Logs (a raw data source) with a detection service, or assume AWS Network Firewall's stateful inspection includes anomaly-based alerting, when in fact GuardDuty is the only service that provides automated threat detection and alerting for network patterns like port scanning and unusual outbound traffic.
Detailed technical explanation
How to think about this question
GuardDuty integrates with VPC Flow Logs by analyzing aggregated flow records for indicators of compromise, such as a single source IP attempting connections to multiple ports on a target (port scan) or a host communicating with known command-and-control servers. Under the hood, GuardDuty uses a combination of rule-based detection (e.g., for known threat IPs from threat intelligence feeds) and unsupervised machine learning models that establish a baseline of normal traffic patterns and flag deviations, such as a sudden spike in outbound traffic to an unusual destination. In a real-world scenario, GuardDuty can detect a compromised EC2 instance performing a reverse shell by identifying outbound traffic to an uncommon port on an external IP that matches a known malicious actor's infrastructure.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon GuardDuty — Amazon GuardDuty is a threat detection service that continuously monitors VPC Flow Logs, DNS logs, and CloudTrail events to identify suspicious network traffic patterns such as port scanning, unusual outbound traffic, and other malicious activities. It uses machine learning, anomaly detection, and integrated threat intelligence to generate security alerts without requiring manual rules or signatures.
What should I do if I get this SCS-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This SCS-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 SCS-C02 exam.
Question Discussion
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