MCQs

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1. What is the primary goal of an API attack?
   a. To enhance user experience
   b. To gain unauthorized access or disrupt services
   c. To reduce server load
   d. To improve data accuracy
   Answer: b
   Source:akamai+1
2. Which type of API attack exploits flaws in input fields to execute malicious SQL commands?
   a. Cross-Site Scripting (XSS)
   b. SQL Injection
   c. Rate Limiting
   d. DDoS
   Answer: b
   Source:qaautomation+2
3. What does a Distributed Denial of Service (DDoS) attack on an API typically attempt to do?
   a. Steal credentials
   b. Overwhelm the API with traffic to disrupt service
   c. Inject malicious code
   d. Manipulate API parameters
   Answer: b
   Source:pynt+1
4. What vulnerability allows attackers to use stolen tokens to impersonate legitimate users in APIs?
   a. Broken Authentication
   b. Cross-Origin Resource Sharing (CORS)
   c. Parameter Tampering
   d. Server-Side Request Forgery
   Answer: a
   Source:checkpoint+1
5. Which attack intercepts data exchanged between two communication endpoints in API requests?
   a. Man-in-the-Middle (MitM)
   b. Brute Force
   c. Cross-Site Request Forgery (CSRF)
   d. Injection
   Answer: a
   Source:akamai+1
6. What is the first step to protect against injection attacks in APIs?
   a. Rate limiting
   b. Input validation and sanitization
   c. Logging user activity
   d. Using plain text API keys
   Answer: b
   Source:qaautomation+1
7. What type of API attack involves manipulating parameters in the request to alter API behavior?
   a. Parameter Tampering
   b. SQL Injection
   c. DDoS
   d. Broken Access Control
   Answer: a
   Source:pynt+1
8. Which security practice helps prevent stolen API key usage?
   a. Storing keys in client-side scripts
   b. Using OAuth tokens and secure storage
   c. Sharing keys publicly
   d. Disabling authentication altogether
   Answer: b
   Source:qaautomation+1
9. What is a common consequence of broken access controls in APIs?
   a. Unauthorized data access or modification
   b. API uptime improvement
   c. Increased performance
   d. Reduced API complexity
   Answer: a
   Source:apimike+1
10. What is the role of rate limiting in API security?
    a. Enhancing UI responsiveness
    b. Limiting the number of requests from a client to prevent abuse
    c. Allowing unlimited access
    d. Encrypting API data
    Answer: b
    Source:examradar+1
11. Which API attack exploits flaws in authorization to access data beyond permitted boundaries?
    a. Broken Object Level Authorization
    b. Cross-Site Request Forgery
    c. Injection
    d. Man-in-the-Middle
    Answer: a
    Source:owasp+1
12. What kind of attack sends forged requests to APIs to exploit the trust between client and server?
    a. Cross-Site Request Forgery (CSRF)
    b. SQL Injection
    c. DDoS
    d. Parameter Tampering
    Answer: a
    Source:pynt+1
13. How can using HTTPS help prevent API attacks?
    a. By encrypting data during transmission
    b. By reducing API complexity
    c. By disabling endpoints
    d. By increasing server memory
    Answer: a
    Source:qaautomation+1
14. What does API security misconfiguration usually lead to?
    a. Security gaps that allow unauthorized access
    b. Improved user interface
    c. Faster response times
    d. Lower costs
    Answer: a
    Source:checkpoint+1
15. What type of API attack involves attackers overwhelming resources to cause service downtime?
    a. DDoS
    b. SQL Injection
    c. Injection
    d. Broken Object Property Level Authorization
    Answer: a
    Source:checkpoint+1
16. What is an example of excessive data exposure in APIs?
    a. Returning sensitive fields in API responses accidentally
    b. Encrypting data at rest
    c. Enforcing rate limits
    d. Token expiration
    Answer: a
    Source:pynt+1
17. How does using tokens improve API security?
    a. By providing secure, revocable authentication
    b. By making data public
    c. By disabling encryption
    d. By allowing unlimited requests
    Answer: a
    Source:examradar+1
18. What API attack exploits API business logic to perform unintended operations?
    a. Business Logic Abuse
    b. SQL Injection
    c. Parameter Tampering
    d. Cross-Site Scripting
    Answer: a
    Source:akamai+1
19. What is the main threat of Man-in-the-Middle attacks on APIs?
    a. Interception and manipulation of data in transit
    b. Overloading server resources
    c. Exposing API documentation
    d. Misconfiguring API endpoints
    Answer: a
    Source:akamai+1
20. What security practice can reduce the risk of credential stuffing on APIs?
    a. Using multi-factor authentication and monitoring unusual logins
    b. Using weak passwords
    c. Leaving API keys exposed
    d. Disabling authentication
    Answer: a
    Source:practical-devsecops+1
21. What is broken function level authorization in APIs?
    a. Failure to restrict access to API functions properly
    b. Too many API requests
    c. Invalid API tokens
    d. Slow response times
    Answer: a
    Source:owasp+1
22. Which attack can occur due to insufficient logging and monitoring in APIs?
    a. Prolonged undetected API compromise
    b. Improved API performance
    c. Better user experience
    d. Increased encryption strength
    Answer: a
    Source:akamai+1
23. How does server-side request forgery (SSRF) impact APIs?
    a. It allows attackers to make malicious requests from the server
    b. It blocks all API requests
    c. It encrypts data transmitted
    d. It prevents DDoS attacks
    Answer: a
    Source:owasp+1
24. What is parameter pollution in API attacks?
    a. Injecting multiple parameters with the same name to manipulate API behavior
    b. Encrypting all API data
    c. Restricting access
    d. Validating inputs
    Answer: a
    Source:checkpoint+1
25. What common mitigation protects APIs from Denial of Service attacks?
    a. Rate limiting and IP filtering
    b. Disabling logging
    c. Sharing API keys publicly
    d. Ignoring traffic spikes
    Answer: a
    Source:pynt+1
26. Which attack targets weak or misconfigured API inventories?
    a. Improper Inventory Management
    b. SQL Injection
    c. Broken Authentication
    d. Cross-Origin Resource Sharing
    Answer: a
    Source:owasp+1
27. What is the impact of API key leakage?
    a. Unauthorized API access and data theft
    b. Faster API performance
    c. Better UI design
    d. Reduced network traffic
    Answer: a
    Source:qaautomation+1
28. Which protocol is used to secure API communications and prevent interception?
    a. Transport Layer Security (TLS)
    b. FTP
    c. HTTP
    d. SMTP
    Answer: a
    Source:akamai+1
29. How do bots commonly affect API security?
    a. By automating credential stuffing, scraping, or DDoS attacks
    b. By updating API documentation
    c. By improving traffic flow
    d. By encrypting sensitive data
    Answer: a
    Source:checkpoint+1
30. What is the typical goal of an API injection attack?
    a. To execute unauthorized commands on the backend
    b. To improve API latency
    c. To secure API keys
    d. To authenticate users
    Answer: a
    Source:pynt+1
31. Which of the following is NOT a recommended defense against API attacks?
    a. Disabling authentication
    b. Input validation
    c. Rate limiting
    d. Token usage
    Answer: a
    Source:checkpoint+1
32. What is the main characteristic of a broken object property level authorization attack?
    a. Manipulating data properties beyond authorized limits
    b. Encrypting data improperly
    c. Overloading API with requests
    d. Using expired tokens
    Answer: a
    Source:owasp+1
33. Why is continuous monitoring important in API security?
    a. To detect and respond to suspicious activities promptly
    b. To reduce software updates
    c. To increase API complexity
    d. To disable endpoints
    Answer: a
    Source:akamai+1
34. What is the function of CORS in API security?
    a. Controls which external domains can access API resources
    b. Enables SQL injections
    c. Disables authentication
    d. Sends encrypted keys
    Answer: a
    Source:examradar+1
35. Which API security risk involves attackers exploiting outdated or incomplete API inventories?
    a. Improper Inventory Management
    b. Parameter Pollution
    c. Injection Attacks
    d. Man-in-the-Middle
    Answer: a
    Source:owasp+1
36. How can API versioning help security?
    a. By phasing out vulnerable endpoints and managing updates securely
    b. By exposing all endpoints simultaneously
    c. By disabling authentication
    d. By increasing server load
    Answer: a
    Source: Common best practices summarized fromcheckpoint+1
37. What is a common vector for API key theft?
    a. Embedding keys in frontend JavaScript
    b. Using encrypted storage
    c. Using OAuth tokens
    d. Keeping keys on server only
    Answer: a
    Source:qaautomation+1
38. What type of API attack abuses third-party API integrations?
    a. Unsafe Consumption of APIs
    b. SQL Injection
    c. DDoS
    d. Parameter Tampering
    Answer: a
    Source:pynt+1
39. Which attack results from attackers brute-forcing API tokens or credentials?
    a. Credential Stuffing
    b. Parameter Pollution
    c. SSRF
    d. Cross-Site Scripting
    Answer: a
    Source:practical-devsecops+1
40. How does encryption protect APIs?
    a. By securing data during transmission and storage from unauthorized access
    b. By increasing data exposure
    c. By removing authentication
    d. By allowing open access
    Answer: a
    Source:qaautomation+1
41. What is a typical characteristic of an injection attack?
    a. Malicious code is executed by the API server
    b. User permissions increase
    c. Traffic is throttled
    d. Data is encrypted
    Answer: a
    Source:akamai+1
42. What does business logic abuse in APIs allow attackers to do?
    a. Perform unintended transactions or operations
    b. Encrypt data
    c. Log out users forcibly
    d. Enhance security settings
    Answer: a
    Source:pynt+1
43. How can strict access controls improve API security?
    a. By ensuring users can only perform authorized actions or access allowed data
    b. By blocking all requests
    c. By exposing data broadly
    d. By allowing anonymous access
    Answer: a
    Source:checkpoint+1
44. In which scenario is broken authentication most dangerous in APIs?
    a. When attackers steal and reuse authentication tokens or credentials
    b. When tokens expire quickly
    c. When CORS is enabled
    d. When encryption is in place
    Answer: a
    Source:akamai+1
45. What is an important measure after detecting an API attack?
    a. Incident response and vulnerability patching
    b. Ignoring the attack
    c. Disabling all APIs permanently
    d. Sharing API keys publicly
    Answer: a
    Source:pynt+1
46. Which attack type focuses on abusing the API rate limits?
    a. Brute Force or DDoS attacks
    b. Injection attacks
    c. Parameter tampering
    d. Cross-Site Scripting
    Answer: a
    Source:examradar+1
47. What does OWASP API Security Top 10 list focus on?
    a. The most critical API security risks and vulnerabilities
    b. UI design tips
    c. Data encryption techniques
    d. Business logic improvements
    Answer: a
    Source:owasp+1
48. How can testing APIs for security vulnerabilities help developers?
    a. It helps identify and fix weaknesses before exploitation
    b. It makes APIs slower
    c. It disables endpoints
    d. It increases API costs
    Answer: a
    Source:testdevjobs+1
49. Which of the following is NOT a common API attack type?
    a. Safe consumption of APIs
    b. SQL Injection
    c. Broken Access Control
    d. Credential Stuffing
    Answer: a
    Source:apimike+1
50. What kind of API attack targets the backend server by sending server requests from user input?
    a. Server-Side Request Forgery (SSRF)
    b. Man-in-the-Middle
    c. Cross-Site Request Forgery
    d. DDoS
    Answer: a
    Source:checkpoint+1

1. https://www.akamai.com/glossary/what-are-api-attacks
2. https://www.pynt.io/learning-hub/api-security-guide/api-attacks
3. https://qaautomation.expert/2025/01/20/multiple-choice-questions-for-security-testing-on-api-testing/
4. https://www.checkpoint.com/cyber-hub/cloud-security/what-is-application-security-appsec/what-is-api-security/api-attack/
5. https://apimike.com/api-attack-types
6. https://examradar.com/fundamentals-of-api-security-in-web-application-security-mcqs/
7. https://owasp.org/www-project-api-security/
8. https://www.practical-devsecops.com/top-api-security-vulnerabilities-guide/
9. https://testdevjobs.com/interview-help/api-testing-interview-questions-and-answers/
10. https://www.igmguru.com/blog/cyber-security-mcqs
11. https://www.placementpreparation.io/mcq/cyber-security/page/4/
12. https://www.scribd.com/document/660905820/Mcq-Quations-of-Cyber-Sequrity-Pdf00
13. https://examradar.com/api-security-and-data-stores-mcqs/
14. https://www.javaguides.net/2022/06/rest-api-quiz-multiple-choice-questions.html
15. https://testbook.com/objective-questions/mcq-on-owasp-top-10-vulnerabilities–5eea6a0d39140f30f369e30b
16. https://www.scribd.com/presentation/669898597/API-MCQ-Set1
17. https://www.javaguides.net/2024/04/cyber-security-quiz-mcq-questions-and-answers.html
18. https://qaautomation.expert/2024/06/10/rest-api-multiple-choice-questions-mcq1/
19. https://www.scribd.com/document/524434738/mcq-questions-on-cyber-security
20. https://www.wallarm.com/whats-wallarm-learning-center-attacks