SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mailbetween hosts over Transmission Control Protocol (TCP). A TCP connection is set upbetween a user agent and a server program. The server listens on TCP port 25 forincoming connection requests. The user end of the connection is on a TCP port numberabove 1023. Suppose you wish to build a packet filter rule set allowing inbound andoutbound SMTP traffic. You generate the following rule set:Rule Direction Src Addr Dest Addr Protocol Dest Port ActionABCDEInOutOutInEitherExternalInternalInternalExternalInternal ExternalAnyExternal InternalAnyTCPTCPTCPTCPAny25> 102325> 1023PermitPermitPermitPermitAny DenySomeone from the outside world (10.1.2.3) attempts to open a connectionfrom port 5150 on a remote host to the Web proxy server on port 8080 onone of your local hosts (172.16.3.4), in order to carry out an attack. Typicalpackets are as follows:Scenario Direction34InSrc Addr10.1.2.3Out 172.16.3.4Dest Addr Protocol172.16.3.4Will the attack succeed? Give details.10.1.2.3TCPTCPDest ActionPort80805150??

IP Address:Each device connected to a computer network that employs the Internet Protocol is given a…

SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail between hosts over Transmission Control Protocol (TCP). A TCP connection is set up between a user agent and a server program. The server listens on TCP port 25 for incoming connection requests. The user end of the connection is on a TCP port number above 1023. Suppose you wish to build a packet filter rule set allowing inbound and outbound SMTP traffic. You generate the following rule set: Rule Direction Src Addr Dest Addr Protocol Dest Port Action A B U C D E In Out Out Internal External In External Either Internal Internal Any External External Internal Any TCP TCP TCP TCP Any 25 > 1023 Permit 25 Permit > 1023 Permit Permit Any Deny Someone from the outside world (10.1.2.3) attempts to open a connection from port 5150 on a remote host to the Web proxy server on port 8080 on one of your local hosts (172.16.3.4), in order to carry out an attack. Typical packets are as follows: Scenario Direction Src Addr Dest Addr Protocol Dest Action Port 3 4 In Out 10.1.2.3 172.16.3.4 172.16.3.4 Will the attack succeed? Give details. 10.1.2.3 TCP TCP 8080 5150 ? ?

SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail between hosts over Transmission Control Protocol (TCP). A TCP connection is set up between a user agent and a server program. The server listens on TCP port 25 for incoming connection requests. The user end of the connection is on a TCP port number above 1023. Suppose you wish to build a packet filter rule set allowing inbound and outbound SMTP traffic. You generate the following rule set: Rule Direction Src Addr Dest Addr Protocol Dest Port Action A B U C D E In Out Out Internal External In External Either Internal Internal Any External External Internal Any TCP TCP TCP TCP Any 25 > 1023 Permit 25 Permit > 1023 Permit Permit Any Deny Someone from the outside world (10.1.2.3) attempts to open a connection from port 5150 on a remote host to the Web proxy server on port 8080 on one of your local hosts (172.16.3.4), in order to carry out an attack. Typical packets are as follows: Scenario Direction Src Addr Dest Addr Protocol Dest Action Port 3 4 In Out 10.1.2.3 172.16.3.4 172.16.3.4 Will the attack succeed? Give details. 10.1.2.3 TCP TCP 8080 5150 ? ?

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

Types Of Protocols

A network protocol is a collection of rules that governs the exchange of data between devices connected to the same network. In other words, network protocols are rules that specify how devices communicate or transfer data over a network. The sender and receiver systems must obey the standards to facilitate communication between them.

Question

SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail
between hosts over Transmission Control Protocol (TCP). A TCP connection is set up
between a user agent and a server program. The server listens on TCP port 25 for
incoming connection requests. The user end of the connection is on a TCP port number
above 1023. Suppose you wish to build a packet filter rule set allowing inbound and
outbound SMTP traffic. You generate the following rule set:
Rule Direction Src Addr Dest Addr Protocol Dest Port Action
A
B
C
D
E
In
Out
Out
In
Either
External
Internal
Internal
External
Internal External
Any
External Internal
Any
TCP
TCP
TCP
TCP
Any
25
> 1023
25
> 1023
Permit
Permit
Permit
Permit
Any Deny
Someone from the outside world (10.1.2.3) attempts to open a connection
from port 5150 on a remote host to the Web proxy server on port 8080 on
one of your local hosts (172.16.3.4), in order to carry out an attack. Typical
packets are as follows:
Scenario Direction
3
4
In
Src Addr
10.1.2.3
Out 172.16.3.4
Dest Addr Protocol
172.16.3.4
Will the attack succeed? Give details.
10.1.2.3
TCP
TCP
Dest Action
Port
8080
5150
?
?

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