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Cisco ASA firewall basics

Get started with Cisco ASA firewall. In this course you will learn to setup and install the Cisco ASA firewall!
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Created by Jimmy Larsson
Last updated 1/2017
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Cisco ASA firewall basics

Last updated 2016-11-24 with new videos!

In the course you will learn everything needed to install and configure a brand new Cisco ASA firewall with outbound internet access.

You will learn all commands needed to install the firewall.

In the first part of the course You will understand which required building blocks there are to get the firewall installed. For each step I will explain the reason, how it works and that there is to think about when configuring the Cisco ASA. This includes:

  • Console access
  • Interface configurations
  • Access-list theory and how to apply them.
  • Restricting and providing management access.
  • Network Address Translation (NAT)
  • DHCP in the Cisco ASA
  • Available hardware models.
  • Security levels.

In the second part of the course we will together configure a Cisco ASA 5505 from no configuration at all to outbound filtered and NAT:ed internet-access with DHCP and access-lists.

By the end of this course you will have a full knowledge of the different building blocks required to install a Cisco firewall.

Who is the target audience?
  • Anyone who needs to understand how to setup a Cisco ASA firewall.
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What Will I Learn?
Install your own firewall
Configure NAT and access-lists.
Understand the best practice recommendations when installing Cisco ASA
View Curriculum
  • Knowledge of TCP/IP
  • General knowledge of what a firewall is
Curriculum For This Course
Expand All 24 Lectures Collapse All 24 Lectures 01:53:54
2 Lectures 05:28

An introduction to the course where I introduce myself and explains the purpose and content of the course.

Preview 01:13

There are many hardware models available. In this lecture you will get introduced to some of them.

Preview 04:15
Bits and pieces of the configuration
14 Lectures 01:09:43

First step in configuring a Cisco ASA is the interface configuration. There are tree commands that always needs to be added to each interface and I will explain them here.

interface configuration

Some firewalls contains a built-in switch and in these cases there is one extra step needed in the interface configuration.


Security-levels might seem confusing. I will explain them here!

Security levels

Hair-pinning and interfaces with the same security-level will be explained in this lecture.

Preview 04:24

I explain how the lab environment I use in this course looks like and works.

The course lab environment

In this lecture You will learn how access-lists works, and how to apply them in the firewall.

Implementing access-lists part 1

More about access-lists

Implementing access-lists part 2

Nat (network address translation) is a complex part of the Cisco ASA configuration. In this lecture you will get introduced to the most common ways of configure Nat in the firewall.

Introduction to NAT

A good command to remember, otherwise your ping will not work.

fixup protocol icmp

How to configure the firewall to allow inbound management access over telnet, ssh and ASDM.

Management access part 1

We will continue to look at how to configure management access-

Management access part 2

There are three commands needed to setup the firewall as a DHCP server. 

Preview 03:23

An introduction to ASDM part 1

More about the ASDM interface

An introduction to ASDM part 2
NAT - Network Address translation
4 Lectures 25:11

A look into the world of NAT

Network Address Translation - part 1

A look into the world of NAT

Network Address Translation - part 2

A look into the world of NAT
Network Address Translation - part 3

A look into the world of NAT
Network Address Translation - part 4
A live configuration
3 Lectures 12:56

In the following lecture I will configure a firewall from scratch. This is the introduction. 

Basic setup intro

This is actually 17 minutes of basic ASA configuration setup. Enjoy!

Demo of basic setup

This is the actual configuration used in the course.

The actual configuration
Bonus section
1 Lecture 00:43
Bonus lecture: About me and my other courses
About the Instructor
4.5 Average rating
298 Reviews
2,731 Students
10 Courses
Senior Consultant, Instructor and CISSP

I have been working in IT since 1991. My focus the last 15 years has been in Routing&Switching and Security. I have certifications in Cisco (CCNA, CCNP, CCSP) since 2000, also certified Checkpoing CCSA/CCSP and ISC2 CISSP. After 20+ years as an IT consultant I have a broad as well as deep knowledge in TCP/IP, routing, switching and firewalling.

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