please answer below questions in one line each. No copying from internet

  

1. List and briefly define three classes of intruders.

2. What are two common techniques used to protect a password file?

3. What are three benefits that can be provided by an intrusion detection system?

4. What is the difference between statistical anomaly detection and rule-based intrusion detection?

5. What metrics are useful for profile-based intrusion detection?

6. What is the difference between rule-based anomaly detection and rule-based penetration identification?

7. What is a honeypot?

8. What is a salt in the context of UNIX password management?

9. List and briefly define four techniques used to avoid guessable passwords.

10. List three design goals for a firewall.

11. List four techniques used by firewalls to control access and enforce a security policy.

12. What information is used by a typical packet filtering firewall?

13. What are some weaknesses of a packet filtering firewall?

14. What is the difference between a packet filtering firewall and a stateful inspection firewall?

15. What is an application-level gateway?

16. What is a circuit-level gateway?

17. What are the common characteristics of a bastion host?

18. Why is it useful to have host-based firewalls?

19. What is a DMZ network and what types of systems would you expect to find on such networks?

20. What is the difference between an internal and an external firewall?