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What does blacklisting involve in input validation?
- A) Allowing only known good input
- B) Rejecting input that is known to be bad
- C) Accepting all input and filtering later
- D) Validating input against a whitelist
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Why is blacklisting considered weaker than whitelisting?
- A) It is easier to implement
- B) It is harder to maintain and keep up to date
- C) It allows more input types
- D) It provides a complete security solution
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What is a common method of implementing blacklisting?
- A) Data type validation
- B) Regular expressions
- C) Output encoding
- D) Data range checks
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In the context of blacklisting, what is a common issue with rejecting known bad content?
- A) It may miss new types of malicious input
- B) It is more secure than whitelisting
- C) It always guarantees complete protection
- D) It is less computationally intensive
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Whitelisting involves:
- A) Accepting input that is known to be good
- B) Rejecting input that matches a blacklist
- C) Using regular expressions to find known bad patterns
- D) Allowing all input and filtering it later
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What is a key advantage of whitelisting over blacklisting?
- A) It requires less maintenance
- B) It ensures only known good input is accepted
- C) It is easier to implement
- D) It allows all types of input
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Which of the following is an example of data validation in whitelisting?
- A) Ensuring a ZIP Code matches the format
^\d{5}(-\d{4})?$ - B) Rejecting input containing
<SCRIPT> - C) Allowing any string but encoding special characters
- D) Using a blacklist to filter bad inputs
- A) Ensuring a ZIP Code matches the format
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What does the regular expression
^\d{5}(-\d{4})?$validate?- A) A U.S. phone number
- B) A U.S. ZIP Code
- C) An email address
- D) A credit card number
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Why might implementing whitelisting be challenging?
- A) It is generally less secure than blacklisting
- B) It can be difficult to anticipate all possible valid inputs
- C) It is simpler than blacklisting
- D) It requires no special handling for complex inputs
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What is the primary goal of an input validation and handling strategy?
- A) To filter out all potential malicious inputs
- B) To ensure multiple layers of defense are applied
- C) To validate only the most common input types
- D) To perform data encryption before storage
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How is input validation performed at the client’s browser in the strategy?
- A) By using a web application firewall (WAF)
- B) By implementing parameterized statements
- C) By applying whitelist validation
- D) By encoding data within the database
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What is the purpose of using parameterized statements in the input validation strategy?
- A) To perform safe SQL execution
- B) To validate input against a whitelist
- C) To encode data for XSS protection
- D) To filter out known bad content
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How should data extracted from the database be handled according to the strategy?
- A) It should be validated against a blacklist
- B) It should be encoded appropriately before use
- C) It should be directly displayed without modification
- D) It should be filtered for malicious content
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What role does a Web Application Firewall (WAF) play in the input validation strategy?
- A) It replaces the need for client-side validation
- B) It provides intrusion detection/prevention and monitors attacks
- C) It exclusively performs blacklisting
- D) It handles encoding and decoding of data
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What is a key benefit of combining whitelisting with output encoding?
- A) It provides a complete solution without additional controls
- B) It enhances protection by validating and safely handling data
- C) It simplifies the validation process by removing all bad data
- D) It guarantees no need for further validation or security measures
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When using blacklisting, what should be used in conjunction with it for better security?
- A) Output encoding
- B) Regular expressions only
- C) Only client-side validation
- D) Data size checks
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What does whitelist validation ensure about the input data?
- A) It is only checked for known bad patterns
- B) It conforms to a set of known good standards and formats
- C) It is validated for size and range only
- D) It is checked against a list of common security threats
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What is a typical challenge when implementing whitelist validation in applications with large character sets?
- A) Difficulty in maintaining blacklists
- B) The need for constant updates to the blacklist
- C) Complex input types and extensive character sets
- D) Limited application of validation rules
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What should be done if an application receives input that is not in the expected form?
- A) Ignore the input and proceed
- B) Log the issue and continue processing
- C) Reject the input and handle it as an error
- D) Accept the input but sanitize it later
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In a defense-in-depth strategy, what role does input validation play?
- A) It is the sole security measure
- B) It is part of a broader set of multiple defense layers
- C) It replaces the need for encryption and data encoding
- D) It exclusively focuses on client-side data handling
Answers:
- B) Rejecting input that is known to be bad
- B) It is harder to maintain and keep up to date
- B) Regular expressions
- A) It may miss new types of malicious input
- A) Accepting input that is known to be good
- B) It ensures only known good input is accepted
- A) Ensuring a ZIP Code matches the format
^\d{5}(-\d{4})?$ - B) A U.S. ZIP Code
- B) It can be difficult to anticipate all possible valid inputs
- B) To ensure multiple layers of defense are applied
- C) By applying whitelist validation
- A) To perform safe SQL execution
- B) It should be encoded appropriately before use
- B) It provides intrusion detection/prevention and monitors attacks
- B) It enhances protection by validating and safely handling data
- A) Output encoding
- B) It conforms to a set of known good standards and formats
- C) Complex input types and extensive character sets
- C) Reject the input and handle it as an error
- B) It is part of a broader set of multiple defense layers