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What is the primary purpose of input validation?
- A) To enhance application performance
- B) To limit user input to required functionality
- C) To improve user experience
- D) To format data for reporting
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At which levels should input validation be performed?
- A) Syntactical and Contextual
- B) Syntactical and Semantic
- C) Structural and Semantic
- D) Contextual and Structural
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Which of the following is an example of syntactical validation?
- A) Ensuring a phone number has a specific format
- B) Checking if a date is valid within a given context
- C) Verifying if an email address is correctly formatted
- D) Ensuring a user cannot enter a date in the past
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What is semantic validation concerned with?
- A) The format of the input data
- B) The correctness of input values within a given context
- C) The length of the input data
- D) The presence of certain characters in the input
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Why is it important to validate input on both the frontend and backend?
- A) To enhance the design of the application
- B) To prevent vulnerabilities from modified requests
- C) To speed up the data entry process
- D) To improve the application’s responsiveness
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What method should be used to ensure input conforms to specific schemas like JSON or XML?
- A) Exception handling
- B) Regular expressions
- C) Data type specification
- D) Strict validation checks
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What is a common approach for handling file uploads securely?
- A) Validate only the file extension
- B) Allow all file types but scan for malware
- C) Validate the file size and extension, and scan for malicious content
- D) Rename files with random names but do not validate them
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Why is it important to validate email addresses on both the client and server sides?
- A) To prevent email spoofing
- B) To ensure emails are correctly formatted and actually exist
- C) To avoid email server downtime
- D) To improve email marketing effectiveness
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Which approach to handling input validation errors involves generating a security error and redirecting to a generic error page?
- A) Recovering
- B) Failing
- C) Logging
- D) Sanitizing
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What is a key disadvantage of the “failing” approach in input validation?
- A) It can mask malicious input
- B) It may disrupt the user experience and lose transactions
- C) It is less secure than recovering
- D) It requires more complex coding
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How should the file path of an uploaded file be set to ensure security?
- A) On the client side
- B) On the server side
- C) By the user
- D) Dynamically based on user input
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Which tool is used for validating email addresses in PHP?
- A) Apache Commons Validator
- B) PHP filter functions
- C) OWASP Java HTML Sanitizer
- D) Java Hibernate Validator
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What should be done to handle special characters in user input effectively?
- A) Encode them
- B) Remove them
- C) Ignore them
- D) Allow all special characters
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When validating file uploads, what aspect should not be ignored?
- A) File path
- B) File content
- C) File creation date
- D) File name length
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What is the purpose of using regular expressions in input validation?
- A) To define the range of allowed characters
- B) To check the entire string rather than just parts of it
- C) To validate the file type
- D) To limit the size of the input
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Why might blacklisting email addresses be problematic?
- A) It may be ineffective as new domains can be easily created
- B) It requires too much server processing power
- C) It is less secure than whitelisting
- D) It is not compatible with many email clients
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What should be done when a validation error occurs to aid in investigation?
- A) Display detailed error messages to the user
- B) Log the error in the application logs
- C) Ignore the error if it’s not critical
- D) Redirect the user to a custom error page
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Which library is specifically designed for sanitizing HTML content in Java?
- A) OWASP Java HTML Sanitizer Project
- B) Java Hibernate Validator
- C) Apache Commons Validator
- D) JEP-290
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What is one approach to validate file content before accepting uploads?
- A) Use regex to check the file extension
- B) Validate the file size and scan for malicious content
- C) Allow all file types and rely on user trust
- D) Rename files to prevent security issues
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What is the purpose of using UUIDs for file uploads?
- A) To ensure the file name is unique and not predictable
- B) To make file names shorter
- C) To improve file upload speed
- D) To comply with email address validation rules
Answers:
- B) To limit user input to required functionality
- B) Syntactical and Semantic
- A) Ensuring a phone number has a specific format
- B) The correctness of input values within a given context
- B) To prevent vulnerabilities from modified requests
- D) Strict validation checks
- C) Validate the file size and extension, and scan for malicious content
- B) To ensure emails are correctly formatted and actually exist
- B) Failing
- B) It may disrupt the user experience and lose transactions
- B) On the server side
- B) PHP filter functions
- A) Encode them
- B) File content
- B) To check the entire string rather than just parts of it
- A) It may be ineffective as new domains can be easily created
- B) Log the error in the application logs
- A) OWASP Java HTML Sanitizer Project
- B) Validate the file size and scan for malicious content
- A) To ensure the file name is unique and not predictable