Fundamentals of Communications and Networking, 3rd Edition

Network Security Essentials

This chapter focuses on security from a network perspective. To get started, let’s define what security means. Security is specific to the IT infrastructure in scope, so network security is a subset of the entire IT infrastructure’s security. Security is often defined by the following three tenets:

• Confidentiality—For sensitive data, the network must secure data transmissions by limiting access, encrypting the payload or transmission, and ensuring the data is secure at rest. Nonrepudiation in network security is the ability to prevent a denial in an electronic message or transaction by confirming its authenticity. FIGURE 14-1 depicts the three tenets of security.
• Integrity—The data itself must be accurate and not ...