The answer is Amazon GuardDuty and AWS CloudTrail. GuardDuty is a threat detection service that continuously monitors for malicious or unauthorized behavior by analyzing VPC Flow Logs, DNS logs, and CloudTrail management and data events, using machine learning and integrated threat intelligence to detect anomalies such as unusual API calls or compromised credentials. CloudTrail, meanwhile, records all API activity across your AWS environment, providing an audit trail that can be analyzed to identify unauthorized access attempts or policy violations. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this pairing tests your understanding of detective controls versus logging services—a common trap is choosing AWS Config, which tracks resource configuration changes, not unauthorized access. Remember the mnemonic “Guard the Trail”: GuardDuty watches for threats, while CloudTrail logs the evidence.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. 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 TWO AWS services can be used to monitor and detect unauthorized access to AWS resources? (Choose two.)
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 for malicious or unauthorized behavior by analyzing VPC Flow Logs, DNS logs, and AWS CloudTrail management and data events. It uses machine learning and integrated threat intelligence to detect anomalies such as unusual API calls, crypto-mining activity, or compromised credentials, making it a correct choice for detecting unauthorized access.
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 Shield
Why it's wrong here
Shield provides DDoS protection, not detection of unauthorized access.
✓
Amazon GuardDuty
Why this is correct
GuardDuty is a threat detection service that uses machine learning and anomaly detection to identify unauthorized behavior.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon Inspector
Why it's wrong here
Inspector is for assessing applications for vulnerabilities and deviations from best practices, not for monitoring unauthorized access.
✓
AWS CloudTrail
Why this is correct
CloudTrail records all API calls, enabling you to audit and detect unauthorized access attempts.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Config
Why it's wrong here
Config evaluates resource configurations against desired policies, but does not detect unauthorized access in real time.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Config (which tracks configuration changes) with a security monitoring service, but Config does not analyze logs or detect unauthorized access; it only records resource state changes and evaluates compliance rules.
Detailed technical explanation
How to think about this question
GuardDuty ingests and processes up to 10 billion events per day per account, correlating findings across multiple data sources using anomaly detection models like neural networks and rule-based engines. For example, it can detect a credential-compromise scenario where an IAM user makes API calls from an unusual geolocation or at an atypical time, triggering a finding with severity levels (Low, Medium, High) that integrate with AWS Security Hub and EventBridge for automated response.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Security and Compliance — This question tests Security and Compliance — 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 for malicious or unauthorized behavior by analyzing VPC Flow Logs, DNS logs, and AWS CloudTrail management and data events. It uses machine learning and integrated threat intelligence to detect anomalies such as unusual API calls, crypto-mining activity, or compromised credentials, making it a correct choice for detecting unauthorized access.
What should I do if I get this DOP-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 DOP-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 DOP-C02 exam.
Question Discussion
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