Question: . Your host in this example has IP address 172.16.1.1. Someone tries to send e-mail from a remote host with IP address 192.168.3.4. If

. Your host in this example has IP address 172.16.1.1. Someone tries

. Your host in this example has IP address 172.16.1.1. Someone tries to send e-mail from a remote host with IP address 192.168.3.4. If successful, this generates an SMTP dialogue between the remote user and the SMTP server on your host consisting of SMTP commands and mail. Additionally, assume that a user on your host tries to send e-mail to the SMTP server on the remote system. Four typical packets for this scenario are as shown: Packet Direction Sre Addr Dest Addr Protocol Dest Port 1 In TCP 2 TCP 3 TCP 4 TCP Out Out In 192.168.3.4 172.16.1.1 172.16.1.1 192.168.3.4 172.16.1.1 192.168.3.4 192.168.3.4 172.16.1.1 25 1234 25 1357 Action ? ? ? ? Indicate which packets are permitted or denied and which rule is used in each case.

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Answer Typically TCP port 25 is used for SMTP traffic so the first and third packets which are both directed to port 25 would likely be permitted The ... View full answer

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