NAD710 – Linux Network NAD710 – Linux Network Security  Security  

How to Protect Your Network

May 25, 2002Professor Tom Mavroidis

System Assessment System Assessment

User AccountsAccess Control listsNetwork Access ControlEncryptionLoggingIntrusion Detection

Protect the ExteriorProtect the Exterior

First you’ll need an exterior router

Routers come in many forms, you have to choose based on your needs

Some are basic (Linksys) Others advanced (Cisco)

Why CiscoWhy Cisco

You would generally need a sophisticated router to be able to block unwanted incoming traffic

Cisco has many different lines of routers to suit any business need

Cisco IOS SoftwareCisco IOS Software

Cisco uses its IOS software to control its routers and switches.

This IOS software make Cisco routers some of the most powerful and versatile routers in the industry

Entry Level RoutersEntry Level Routers

If you don’t need such a sophisticated router you can use one of the entry level routers like Linksys, Dlink or SMC. Each come with their own proprietary configuration screens

Perimeter SecurityPerimeter Security

Perimeter security devices inside the network are designed to control access to networks and to hide data moving outside the network. There are numerous vulnerabilities inside the network. Secure networking cannot be achieved without addressing these vulnerabilities.

Perimeter SecurityPerimeter Security

This element provides the means to control access to critical network applications, data, and services so that only legitimate users and information can pass through the network.

Controlling who gets inControlling who gets in

Routers and switches with access control lists and/or stateful firewalling, as well as dedicated firewall appliances provide this control.

Complementary tools, including virus scanners and content filters, also help control network perimeters