write answers for these questions in a document

I’m trying to study for my Computer Science course and I need some help to understand this question.

  • 11.1 List and briefly define three classes of intruders.
  • 11.2 What are two common techniques used to protect a password file?
  • 11.3 What are three benefits that can be provided by an intrusion detection system?
  • 11.4 What is the difference between statistical anomaly detection and rule-based intrusion detection?
  • 11.5 What metrics are useful for profile-based intrusion detection?
  • 11.6 What is the difference between rule-based anomaly detection and rule-based penetration identification?
  • 11.7 What is a honeypot?
  • 11.8 What is a salt in the context of UNIX password management?
  • 11.9 List and briefly define four techniques used to avoid guessable passwords.