Introduction to Firewalls

If you know the basics of networking but have been mystified by firewalls, this course is for you. This course will give you the detailed fundamentals of how a stateful firewall operates and how it functions in a network.
Course info
Rating
(54)
Level
Intermediate
Updated
May 16, 2016
Duration
2h 0m
Table of contents
Description
Course info
Rating
(54)
Level
Intermediate
Updated
May 16, 2016
Duration
2h 0m
Description

Firewalls have quickly become a mandatory part of every network, and most IT professionals and developers have experienced a situation where their application isn't working on a network so it blames the firewall. This course, Introduction to Firewalls, will help you understand the basics of how they operate so that you will better understand their function in the network. First, you will learn the specific functions of a stateful firewall: the TCP state table followed by Network Address Translation. Next, you will see how these two services operate on non-specific firewall, and then see it in action on a Cisco ASA 5512 firewall. Finally, you will watch how DMZs are used and how we get pings through a firewall. By the end of this course, you will understand that a firewall is not just a "magic box," but an essential part of a network, and you'll also know how to get the most use out of them.

About the author
About the author

For nearly 20 years, Ross has taught and managed data networks.

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Transcript
Transcript

Hi everyone, my name is Ross Bagurdes and welcome to my course Introduction to Firewalls. I am a Network Engineer with 20 years professional experience working in IT Operations, specifically data networking in enterprise organizations. I started my work in IT education because I, like most IT Pros, have found Information Technology books and training to fail to provide clear, in-depth, practical information to an IT professional. My aim is to change that for IT pros working in data networking.

Firewalls are incredibly interesting devices, who’s overall operation is complex, but the individual components that make it work are relatively simple. If you understand the simple components, the big picture of firewall operation will make a lot of sense.

In this course, we are going to

  • Learn how the TCP state table allows traffic to flow from networks you trust to networks you don’t and back again.
  • Understand how we use NAT, specifically source NAT to connect private networks to the Intertnet.
  • Understand what a DMZ is and why we use it.

By the end of this course you will have a solid understanding of the features that make a stateful firewall operate.

Before beginning the course you should be familiar with basic network functionality, including IP addressing and networks, TCP operation including the 3 way handshake and port numbers, and a basic understanding of packet encapsulation.

From here, you should feel comfortable diving into more Data Networking with courses on:


I hope you’ll join me on this journey to learn firewall operation with the intro to firewalls course, at Pluralsight.