You hear a lot of talk about firewalls in relation to network security. The name “firewall” comes from the building industry and it denotes a wall constructed to stop (or at least slow) the spread of fire from one space to another. In network security, a firewall serves the same purpose. But instead of being built from bricks or steel it is built with computers and routers. But the concept is still the same. A network firewall is designed to protect what’s “inside” the firewall from what may be “outside.” Most often, you will hear firewalls used in reference to Internet protection, and most. | Information Security The Big Picture - Part IV Stephen Fried Information Security The Big Picture - SANS GIAC 2000 1 Agenda General Security Introduction Telecommunications Fundamentals Network Fundamentals Network Security World Wide Web Security Information Secrecy Privacy Identification and Access Control Programmatic Security Conclusion Information Security The Big Picture - SANS GIAC 2000 2 Next up is Network Security. This section will take our discussion of network protocols and configuration one step further. In this section we will learn about network configuration network attacks and various other network security topics. 2 Firewalls Firewalls protect inside from outside Can be a single machine or a series of machines Allow for filtering and inspection of packets Basic Types - Application Gateways - Packet Filters - Stateful Inspectors Information Security The Big Picture - SANS GIAC 2000 3 You hear a lot of talk about firewalls in relation to network security. The name firewall comes from the building industry and it denotes a wall constructed to stop or at least slow the spread of fire from one space to another. In network security a firewall serves the same purpose. But instead of being built from bricks or steel it is built with computers and routers. But the concept is still the same. A network firewall is designed to protect what s inside the firewall from what may be outside. Most often you will hear firewalls used in reference to Internet protection and most companies that are on the Internet today use a firewall to protect their corporate networks from the evils of the Big Bad Internet. A firewall can be as simple as a single box. In some cases you can even use a network router to handle basic firewall protection. More often a firewall is a dedicated computer running specialized software that can track and analyze the traffic passing into and out of the network and act quickly to prevent dangerous connections. However in some instances the .
