Chapter 1: Overview of Network Security

Cisco Press

At the same time networks are growing exponentially, they are becoming complex and mission critical, bringing new challenges to those who run and manage them. The need for integrated network infrastructure comprising voice, video, and data (all-in-one) services is evident, but these rapidly growing technologies introduce fresh security concerns. 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 high-growth 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.

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