By Mark McGregor
Half 1: Internetwork layout offers a collection of common guidance for making plans internetworks and particular feedback for a number of key internetworking implementations. half 1 makes a speciality of deciding upon the fundamental applied sciences and applicable implementations for particular environments. half 2: Internetworking Case experiences offers sensible examples illustrating how readers can enforce Cisco structures software program beneficial properties. Case stories tackle implementation issues and exhibit the way to follow positive factors. unique configuration dossier examples and community diagrams are integrated.
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Additional resources for Internetworking Case Studies
The word security connotes protection against malicious attack by outsiders. Security also involves controlling the effects of errors and equipment failures. Anything that can protect against a deliberate, intelligent, calculated attack will probably prevent random misfortune as well. Security measures keep people honest in the same way that locks do. This case study provides specific actions you can take to improve the security of your network. Before going into specifics, however, it will help if you understand the following basic concepts that are essential to any security system: • Know your enemy This case study refers to attackers or intruders.
When you design your security measures, understand their costs and weigh those costs against the potential benefits. To do that, you must understand the costs of the measures themselves and the costs and likelihoods of security breaches. If you incur security costs out of proportion to the actual dangers, you have done yourself a disservice. • Identify your assumptions Every security system has underlying assumptions. For example, you might assume that your network is not tapped, or that attackers know less than you do, that they are using standard software, or that a locked room is safe.
Some companies have implemented formalized network security training for their employees; that is, employees are not allowed access to the Internet until they have completed a formal training program. 3-2 Internetworking Case Studies Controlling Access to Cisco Routers • Know your weaknesses Every security system has vulnerabilities. You should understand your system’s weak points and know how they could be exploited. You should also know the areas that present the largest danger and prevent access to them immediately.