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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Concept explainers

Network Protocols

A network protocol is a set of rules that govern how data is exchanged between the devices in a network. Network protocols enable communication between devices that are located in different parts of the world. Consequently, they are critical in today's digital communications.

Question

Rule Direction
In
Out
Out
In
Either
ABCDE
Src Addr Dest Addr Protocol Dest Port
TCP
TCP
TCP
TCP
Any
External
Internal
Internal
External
Any
Internal
External
External
Internal
Any
80
>1023
80
>1023
Any
Action
Permit
Permit
Permit
Permit
Deny

Packet
1
2
3
4
6
Packet Direction
5
In
Out
Src Addr
219.168.3.4
172.16.1.1
172.16.1.1
219.168.3.4
172.16.1.1
219.168.3.4
219.168.3.4
172.16.1.1
Src Addr
210.1.2.3
172.16.3.4
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.
Direction
Dest Addr
In
Out
Out
In
Dest Port
Protocol
TCP
TCP
TCP
TCP
25
1234
80
1357
Dest Addr
172.16.3.4
210.1.2.3
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.
Protocol
TCP
TCP
Action
?
?
?
?
8080
5150
Dest Port Action
?
?

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