By Richard Deal
This e-book is a part of the Networking expertise sequence from Cisco Press, which bargains networking execs worthy info for developing effective networks, figuring out new applied sciences, and construction winning careers.
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Extra info for Cisco router firewall security
This method of encryption is used on connections that traverse multiple hops, such as internal networks, public networks, and the Internet. NOTE Because encryption is very process intensive, it typically is used for external connections; in other words, it typically is not used inside your network. For internal security, you might want to include in your security policy a statement that prohibits eavesdropping, with severe penalties applied. However, for sensitive information, encryption should be used to protect it.
I also discuss some general design guidelines on using firewall products to protect your network infrastructure. These subjects are discussed in this chapter: • Firewall overview • Traffic control and the OSI reference model • Firewall categories • Firewall design • Cisco IOS security < Day Day Up > < Day Day Up > Firewall Overview Firewall technologies have undergone substantial changes since their entry into the marketplace in the early 1990s. These first firewalls were simple packet-filtering devices.
These changes could be something as simple as modifying file contents on a file server or something as sophisticated as changing packet contents as they are in transit from a source to a destination machine. A common attack that hackers employ is to break into your web server and change the content (web pages). This form of attack is called graffiti. This type of attack has happened to many organizations, typically government resources; a hacker breaks into a web server and replaces the web content with pornography or "interesting" political content.