You're reading from ISACA Certified in Risk and Information Systems Control (CRISC®) Exam Guide

Product typeBook

Published inSep 2023

PublisherPackt

ISBN-139781803236902

Edition1st Edition

Concepts

Cybersecurity

Author (1)

Shobhit Mehta

Firewalls

A firewall is a network security device that monitors both incoming and outgoing network traffic and either permits or prohibits specific traffic based on predefined security rules. A firewall can be a physical device (hardware) or software. The following is a summary of different types of firewalls that can be installed as hardware or software:

Packet filtering firewall: These firewalls compare each packet to established criteria and allow/deny packet traffic based on predefined rules. These firewalls work on Layer 3 (the network layer) of the OSI model.
Circuit-level gateway firewall: These firewalls monitor TCP handshakes and established sessions to determine the legitimacy of the traffic. These firewalls work on Layer 5 (the session layer) of the OSI model.
Application-level gateway firewall: These firewalls provide the most secure connectivity as they examine each layer of communication. These firewalls work on the application layer (Layer 7) of the OSI...

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ISACA Certified in Risk and Information Systems Control (CRISC®) Exam Guide

Published in: Sep 2023Publisher: PacktISBN-13: 9781803236902

Author (1)

Shobhit Mehta

Shobhit Mehta is the Security and Compliance Director at Headspace, an on-demand mental health company in San Francisco, CA. Previously, he worked in different facets of security and assurance with HSBC, Deutsche Bank, Credit Suisse, PayPal, and Fidelity Investments. He also works with ISACA to develop exam questions for CISA, CISM, and CGEIT, served as the technical reviewer for the CGEIT and CISA review manuals, and is a published author for the COBIT 5 journal. He completed his MS in cybersecurity at Northeastern University, Boston, and holds CRISC, CISM, CISA, CGEIT, CISSP, and CCSP certifications. In his spare time, he likes to explore the inclined trails of the Bay Area, complete ultramarathons, and blog on GRCMusings.
Read more about Shobhit Mehta

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Firewalls

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Author (1)

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