Lecture1

1.1 Network Security Definition
Before defining the network security we should know the security or the information security, where Information security includes the broad areas of information security management, computer and data security, and network security as shown in Figure 1.1.
At the heart of the study of information security is the concept of policy. Policy, awareness, training, education, and technology are vital concepts for the protection of information and for keeping information systems from danger.
Network security is the protection of information and systems and hardware that use, store, and transmit that information.
Network security should provide, data confidentiality, Data integrity and Data availability.
The need for network security and its growth are driven by many factors:
• Internet connectivity is 24/7 and is worldwide
• Increase in cyber crime
• Impact on business and individuals
• Legislation & liabilities
• Proliferation of threats
• Sophistication of threats