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Routing Fundamentals

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Hello, welcome to Routing Fundamentals. Just like it is important to understand how networks operate in order to secure them, it is also critical to understand how routers and routing work in order to have a secure network. What allows people from all over the world to communicate and what allows the Internet to function is routers. Routers are responsible for determining the path and sending traffic from source to destination. | Routing Fundamentals Security Essentials The SANS Institute Routing Fundamentals - SANS 2001 1 Hello welcome to Routing Fundamentals. Just like it is important to understand how networks operate in order to secure them it is also critical to understand how routers and routing work in order to have a secure network. What allows people from all over the world to communicate and what allows the Internet to function is routers. Routers are responsible for determining the path and sending traffic from source to destination. As you can imagine because they play such a key role it is critical that they are properly secured because they are often the target of attacks. If someone can compromise a router they can read modify or delete any traffic that goes through it and this can cause a variety of problems. Based on router importance from a functionality and security standpoint we have devoted a module to looking into the wonderful world of routers. 5 - 1 Agenda Routers Cisco IOS Routing Routing Protocols Access Control Lists Firewalls Routing Fundamentals - SANS 2001 2 In this module we are going to cover an overview of routers. We are going to start by looking at what a router is and how it works. We will then cover the routing operating system or IOS. How routing actually works and why there are two addresses will also be covered along with several examples. How routers communicate with each other via routing protocols will be discussed and we will wrap up the module with a brief look at how routers can filter traffic via access control lists. It is important to point out that the subject of routers is very complex and there are several week courses on each topic covered in this module. This module is meant to give you a high level overview and introduce you to several of these topics not to provide a comprehensive coverage of the material. Also this module tries to stay general but in certain cases if we have to discuss the specifics of a router we will be using Cisco