Security interview questions for network admin

1. What is a firewall?
2. Describe, genrally, how to manage a firewall
3. What is a Denial of Service attack?
4. What is a “spoofed” packet?
5. What is a SYN Flood?
6. What do you do if you are a victim of a DoS?
7. What is GPG/PGP?
8. What is SSH?
9. What is SSL? How do you create certificates?
10. What would you do if you discovered a UNIX or Network device on your network has been compromised?
11. What would you do if you discovered a Windows system on your network has been comrpromised?
12. What is DNS Hijacking?
13. What is a log host?
14. What is IDS or IDP, and can you give me an example of one?
15. Why are proxy servers useful?
16. What is web-caching?