ACLs vs Capabilities

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Questions and Answers

Which type of CAPTCHA is NOT mentioned in the text?

  • Audio
  • Visual
  • OCR
  • Text-based (correct)

What is the purpose of using CAPTCHA?

  • To index websites by search engines
  • To prevent access by bots/computers (correct)
  • To generate and grade tests
  • To filter out spam emails

What was the original motivation for creating CAPTCHA?

  • To prevent automated bots from stuffing ballot boxes (correct)
  • To provide free email services
  • To index websites by search engines
  • To challenge humans with difficult tests

What is the main advantage of a packet filter firewall?

<p>Speed (B)</p> Signup and view all the answers

What is the main disadvantage of a stateful packet filter?

<p>Slower than packet filtering (D)</p> Signup and view all the answers

What does a firewall do in the context of network security?

<p>Controls access to a network (C)</p> Signup and view all the answers

What is the purpose of an application proxy firewall?

<p>To provide a complete view of connections and application data (A)</p> Signup and view all the answers

What is the role of a CAPTCHA in preventing automated sign-ups for email accounts?

<p>To prevent access by bots/computers (A)</p> Signup and view all the answers

What is the main challenge in breaking CAPTCHAs?

<p>Segmentation problem (C)</p> Signup and view all the answers

What is the analogy used to describe the role of a firewall?

<p>A secretary filtering meeting requests (B)</p> Signup and view all the answers

Which access control mechanism is easier to prevent the problem of a confused deputy?

<p>Capabilities (A)</p> Signup and view all the answers

What is the main disadvantage of using Capabilities as an access control mechanism?

<p>It is more difficult to implement (B)</p> Signup and view all the answers

What is the purpose of a CAPTCHA?

<p>To tell humans and computers apart (D)</p> Signup and view all the answers

What is the main advantage of using ACLs as an access control mechanism?

<p>It is data-oriented (A)</p> Signup and view all the answers

What is the main disadvantage of using ACLs as an access control mechanism?

<p>It is difficult to delegate authority (B)</p> Signup and view all the answers

What is the purpose of a CAPTCHA being 'automated'?

<p>To generate and score tests (D)</p> Signup and view all the answers

What is the purpose of a CAPTCHA being 'public'?

<p>To tell humans and computers apart (A)</p> Signup and view all the answers

What is the purpose of a CAPTCHA being a 'Turing test'?

<p>To tell humans and computers apart (C)</p> Signup and view all the answers

What is the purpose of a CAPTCHA being 'human interactive proof'?

<p>To test the knowledge of users (D)</p> Signup and view all the answers

What is the main challenge with ACLs to avoid the problem of a confused deputy?

<p>Maintaining association between authority and intended purpose (C)</p> Signup and view all the answers

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Chapter 8.ppt

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