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 In External Internal Either Internal Out Internal External External External Internal Any Any a. Describe the effect of each rule. TCP TCP TCP TCP Any 25 > 1023 25 > 1023 Any Permit Permit Permit Permit Deny

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 In External Internal Either Internal Out Internal External External External Internal Any Any a. Describe the effect of each rule. TCP TCP TCP TCP Any 25 > 1023 25 > 1023 Any Permit Permit Permit Permit Deny

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
External Internal
Any
Any
a. Describe the effect of each rule.
TCP
TCP
TCP
TCP
Any
25
> 1023
25
> 1023
Permit
Permit
Permit
Permit
Any Deny
A

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