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File name course_firewall_basics.pdf

Firewall basics Lessons This course provides a basic introduction to firewalls for students who lack a networking background. It is designed to help students understand what a firewall is, and why they might want or need one. The course also includes a basic introduction to the Internet protocol suite known as TCP/IP (Transmission Control Protocol/Internet Protocol) to establish key basic concepts and vocabulary for students. The lessons examine how firewalls work and the technologies behind them, define basic Internet security policies, and explore common firewall configurations and uses. It also includes a lesson on assessing firewall needs and on finding the right firewall to meet those needs. The course concludes with a review of common security hacks, and explains how much protection a firewall can really offer against hackers. 1. What a firewall can do for you In this lesson, you'll learn the three basic principles about firewalls: what a firewall is, why you need one, and how to get one. 2. TCP/IP primer In this lesson, you'll learn about TCP/IP and how firewalls work with it to keep your network secure. TCP/IP is essential to your understanding of how firewalls and related technologies work. 4. Firewall technologies In this lesson, you'll learn about different kinds of firewalls. The discussion of each firewall type will include an overview of its functionality, requirements, and its pros and cons. 5. Security policies In this lesson, you'll learn how to define the business rules that should govern how your firewall manages traffic into and out of your network. 7. Your ideal firewall In this lesson, you'll learn how to narrow your firewall needs, understand your options, and understand how much you can expect to pay for your firewalls. 6. Common firewall configurations In this lesson, you'll learn how common firewall configurations meet common security needs and policies, as well as how to test and evaluate firewall effectiveness. 3. Inside a firewall In this lesson, you'll learn how a firewall works, and find out which features and functions are typically found in most firewalls. What's a firewall? What a firewall can do for you 8. Planning for attacks In this lesson, you'll learn about common firewall security attacks and how you can prevent them. You'll briefly cover best security practices as well. In this lesson, you'll learn the three basic principles about firewalls: what a firewall is, why you need one, and how to get one. When creating a link to the internet, a firewall sits between the private, or internal, side of the connection and the public, or outside, side of that same connection. The connection can contain only a single system or one or more networks, as shown in Figure 1-1. Simply put, a firewall's primary job is to examine inbound traffic -- that is, traffic coming from the public side of the link destined for the private side of that link -- to make sure it's okay before permitting that traffic to pass through