Cisco Networking Simplified, Second Edition

Chapter . Network Security

A company’s network is like any other corporate asset: It is valuable, and it affects the company’s success and revenue. More than ever, the corporate computer network, and the data on it, is the most valuable asset of many companies. Therefore, it must be protected. Generally, middle- to large-size companies appoint a chief security officer, whose job is to develop and enforce corporate security policies.

Security threats present themselves in many forms:

• A hacker breaking into the network to steal confidential information or destroy corporate data

• A natural disaster such as a fire, tornado, or earthquake destroying computer and network equipment

• A disgruntled employee intentionally trying to modify, steal, or destroy corporate ...