Therefore, as network managers struggle to include the latest technology in their network
infrastructure, network security has become a pivotal function in building and maintaining today's modern highgrowth
networks.
This chapter presents a broad description of network security in the context of today's rapidly changing network
environments. The security paradigm is changing, and security solutions today are solution driven and designed
to meet the requirements of business. To help you face the complexities of managing a modern network, this
chapter discusses the core principles of security??”the CIA triad: confidentiality, integrity, and availability.
In addition to discussing CIA, this chapter discusses security policies that are the heart of all network security
implementations. The discussion covers the following aspects of security policies: standards, procedures,
baselines, guidelines, and various security models.
The chapter takes a closer look at the perimeter security issue and the multilayered perimeter approach. The
chapter concludes with the Cisco security wheel paradigm involving five cyclical steps.
Fundamental Questions for Network Security
When you are planning, designing, or implementing a network or are assigned to operate and manage one, it is
useful to ask yourself the following questions:
What are you trying to protect or maintain? 1.
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