b. Your host IP address is 172.16.1.1. Someone access from a remote host with IP address 219.168.3.4 to the HTTP server on your host. And a user on your host try to send an email to the remote system. Four packets as shown. Indicate which packets are permitted or denied and which rule is used in each case. Packet Direction Dest Addr Src Addr 219.168.3.4 In 172.16.1.1 Out 172.16.1.1 219.168.3.4 Out 172.16.1.1 219.168.3.4 219.168.3.4 172.16.1.1 In 1234 2 Packet 5 6 Direction In Out Src Addr 210.1.2.3 172.16.3.4 Protocol Dest Port TCP TCP TCP TCP 25 1234 80 1357 c. Someone from IP address 210.1.2.3 tries to open a connection from port 5150 on a remote host to the web proxy server on port 8080 on your host (172.16.3.4) in order to carry out an attack. The packets are shown below. Will the attack succeed? Explain your answer in details. 172.16.3.4 210.1.2.3 Action ? Dest Port Protocol Dest Addr TCP TCP 8080 5150 ? ? ? Action ? ?

b. Your host IP address is 172.16.1.1. Someone access from a remote host with IP address 219.168.3.4 to the HTTP server on your host. And a user on your host try to send an email to the remote system. Four packets as shown. Indicate which packets are permitted or denied and which rule is used in each case. Packet Direction Dest Addr Src Addr 219.168.3.4 In 172.16.1.1 Out 172.16.1.1 219.168.3.4 Out 172.16.1.1 219.168.3.4 219.168.3.4 172.16.1.1 In 1234 2 Packet 5 6 Direction In Out Src Addr 210.1.2.3 172.16.3.4 Protocol Dest Port TCP TCP TCP TCP 25 1234 80 1357 c. Someone from IP address 210.1.2.3 tries to open a connection from port 5150 on a remote host to the web proxy server on port 8080 on your host (172.16.3.4) in order to carry out an attack. The packets are shown below. Will the attack succeed? Explain your answer in details. 172.16.3.4 210.1.2.3 Action ? Dest Port Protocol Dest Addr TCP TCP 8080 5150 ? ? ? Action ? ?

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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