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 will generate an SMTP dialogue, consisting of SMTP commands and mail, between the remote user and the SMTP server on your host. Assume that a user on your host tries to send packets for this scenario as shown: Scenario Direction Src Addr 1 2 In Out Dest Addr 192.168.3.4 172.16.1.1 Protocol Dest Port Action TCP 172.16.1.1 192.168.3.4 TCP 25 1234 ? ? Indicate which packets are permitted or denied, and which rule is used in each case.
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 will generate an SMTP dialogue, consisting of SMTP commands and mail, between the remote user and the SMTP server on your host. Assume that a user on your host tries to send packets for this scenario as shown: Scenario Direction Src Addr 1 2 In Out Dest Addr 192.168.3.4 172.16.1.1 Protocol Dest Port Action TCP 172.16.1.1 192.168.3.4 TCP 25 1234 ? ? Indicate which packets are permitted or denied, and which rule is used in each case.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text: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 will generate an SMTP
dialogue, consisting of SMTP commands and mail, between the remote user and the SMTP server on your host. Assume that a user on your host tries to send packets for this
scenario as shown:
Scenario Direction Src Addr Dest Addr Protocol Dest Port Action
1
2
In
Out
192.168.3.4 172.16.1.1
172.16.1.1 192.168.3.4
Indicate which packets are permitted or de
TCP
TCP
25
1234
?
?
and which rule is used in each case.

Transcribed Image Text:Rule Direction Src Addr Dest Addr Protocol Dest Port Action
A
B
с
D
E
In
Out
Out
In
Either
External
Internal
Internal
Internal
Any
External
External
External Internal
Any
TCP
TCP
TCP
TCP
Any
25
> 1023
25
> 1023
Any
Permit
Permit
Permit
Permit
Deny
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