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3. Where do we use transport-mode IPSec and tunnel-mode IPSec, respectively? What parts o the packetsdo they encrypt?

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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.)

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.)

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