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4. In tunnel-mode IPSec, i authentication is done beoreencryption, what sequence o headers would we havein the packets? (The headers include AH (Authentica-tion Header), ESP (Encapsulation Security Payload),IP, TCP or UDP.)

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5. Packet-f lter vs. application-proxy f rewalls? (Com-pare their purpose and where they are implemented inLinux systems.)

6. Virus vs. worm? (Compare their characteristics andmodel o replication.)

7. DoS (denial o service) vs. buer over ow attack?(Compare their purpose and operations.)

8. In what situation will an IDS (intrusion detectionsystem) such as Snort have a alse positive or alsenegative?

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