![]() Higher levels in the OSI model provide a better or finer capability of controlling data that enters your network, at the expense of performance. ![]() Some technologies span more than one layer. The Open System Interconnection (OSI) model shown in the following table provides a view of each layer mapped to the corresponding Internet firewall technologies. This section focuses on understanding the firewall portion only. As previously mentioned, designing an effective security policy that meets your needs requires careful planning and consideration of your objectives. The purpose of a firewall is to create a system that prevents unauthorized users from accessing proprietary information. Or you can allow some access from the Internet, but only to selected servers for e-mail or general corporate information. You can set up your firewall to deny access to a private network from the Internet, but to allow access to the Internet. A firewall also helps regulate the type of traffic that can access the intranet and provides information about that traffic to the administrator. An effective firewall between the intranet or private network and the Internet, or between intranet segments, enforces corporate security and access control policies. ![]() Novell BorderManager Firewall Solutionsįirewalls are a combination of hardware and software that reduce the risk of a security breach into a private intranet. ![]() This section discusses several types of firewalls and describes the firewall services provided by Novell BorderManager 3.7. ![]()
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