The two actions to secure your Amazon Cognito web application are enabling multi-factor authentication (MFA) and using HTTPS for all communication between the client and the application. MFA adds a critical second layer of defense by requiring a time-based one-time code from an authenticator app or SMS, which protects against credential theft even if a password is compromised. HTTPS ensures that all data exchanged between the browser and your app is encrypted in transit, preventing man-in-the-middle attacks and eavesdropping. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of Cognito’s native security features and the principle of defense in depth. A common trap is to overlook HTTPS because it seems obvious, but the exam emphasizes that encryption in transit is a non-negotiable security baseline. Remember the mnemonic “MFA + HTTPS = double lock” to recall that authentication strength and transport security must always be paired together.
DVA-C02 Security Practice Question
This DVA-C02 practice question tests your understanding of security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A developer is building a web application that uses Amazon Cognito for user authentication. Which TWO actions should be taken to secure the application?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable multi-factor authentication (MFA) for users.
Option A is correct because enabling multi-factor authentication (MFA) adds an extra layer of security beyond just a password, requiring users to provide a second factor (e.g., a one-time code from an authenticator app or SMS). This significantly reduces the risk of unauthorized access due to compromised credentials. Amazon Cognito supports MFA natively, allowing developers to enforce it for user pools.
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.
✓
Enable multi-factor authentication (MFA) for users.
Read the scenario before looking for a memorised answer.
✗
Use IAM users for authentication instead of Cognito.
Why it's wrong here
IAM users are for AWS access, not for application users.
✗
Store user tokens in local storage for persistence.
Why it's wrong here
Local storage is vulnerable to XSS attacks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think disabling token expiration improves user experience, but they overlook the critical security risk of token theft and the need for short-lived tokens (e.g., 1 hour for access tokens) combined with refresh tokens to balance security and usability.
Detailed technical explanation
How to think about this question
HTTPS (option C) ensures that all data exchanged between the client and the application is encrypted using TLS, preventing man-in-the-middle attacks and eavesdropping. In Amazon Cognito, the authentication flow (e.g., SRP protocol) relies on secure channels; without HTTPS, sensitive tokens and credentials could be intercepted in plaintext. A real-world scenario where this matters is when users authenticate over public Wi-Fi; HTTPS protects the entire OAuth 2.0 token exchange from being captured.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable multi-factor authentication (MFA) for users. — Option A is correct because enabling multi-factor authentication (MFA) adds an extra layer of security beyond just a password, requiring users to provide a second factor (e.g., a one-time code from an authenticator app or SMS). This significantly reduces the risk of unauthorized access due to compromised credentials. Amazon Cognito supports MFA natively, allowing developers to enforce it for user pools.
What should I do if I get this DVA-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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Question Discussion
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