SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail between hosts. 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.You have defined the packet filter rule set shown in the table below. These rules permit and/or deny inbound and outbound traffic between the user agent and the mail server. Describe the purpose of each packet filter rule in the table. RuleDirectionSource AddressDestination AddressProtocolDestination PortActionA2InExternalInternalTCP25PermitB2OutInternalExternalTCP> 1023PermitC2OutInternalExternalTCP25PermitD2InExternalInternalTCP> 1023PermitE2EitherAnyAnyAnyAnyDeny

Packet filtering is a technique used in firewalls to control the flow of data based on specific…

Answered: SMTP (Simple Mail Transfer Protocol) is…

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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SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail between hosts. 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.

You have defined the packet filter rule set shown in the table below. These rules permit and/or deny inbound and outbound traffic between the user agent and the mail server. Describe the purpose of each packet filter rule in the table.

Rule	Direction	Source Address	Destination Address	Protocol	Destination Port	Action
A2	In	External	Internal	TCP	25	Permit
B2	Out	Internal	External	TCP	> 1023	Permit
C2	Out	Internal	External	TCP	25	Permit
D2	In	External	Internal	TCP	> 1023	Permit
E2	Either	Any	Any	Any	Any	Deny

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