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You're reading from  Certified Information Security Manager Exam Prep Guide - Second Edition

Product typeBook
Published inDec 2022
PublisherPackt
ISBN-139781804610633
Edition2nd Edition
Concepts
Information Security
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Author (1)
Hemang Doshi
Hemang Doshi
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Hemang Doshi

Hemang Doshi has more than 15 years of experience in the field of system audit, IT risk and compliance, internal audit, risk management, information security audit, third-party risk management, and operational risk management. He has authored several books for certification such as CISA, CRISC, CISM, DISA, and enterprise risk management.
Read more about Hemang Doshi

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Firewall Types and Implementations

A firewall is a device that monitors and controls network traffic. It is generally placed between an enterprise's internal network and the internet to protect the organization's systems and infrastructure.

A security manager should understand the following types of firewalls, as well as how they should be structured for better protection of information assets:

Figure 8.1: Types of firewalls

Types of Firewalls

The following are the basic characteristics of these different types of firewalls.

Packet filtering Router

A packet filtering router is the simplest, and the standard, version of a firewall. It tracks the IP addresses and port numbers of both the destination and source and acts (either to allow or deny the connection) as per the defined rules. A packet filtering router functions at the network layer of the Open Systems Interconnection (OSI) model.

Stateful Inspection

A stateful inspection firewall...

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Certified Information Security Manager Exam Prep Guide - Second Edition
Published in: Dec 2022Publisher: PacktISBN-13: 9781804610633
© 2022 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Hemang Doshi

Hemang Doshi has more than 15 years of experience in the field of system audit, IT risk and compliance, internal audit, risk management, information security audit, third-party risk management, and operational risk management. He has authored several books for certification such as CISA, CRISC, CISM, DISA, and enterprise risk management.
Read more about Hemang Doshi

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