FOR MOST BUSINESSES AND ORGANIZATIONS today, networks and telecommunications are critical parts of business infrastructure. Many organizations could not operate if their networks were unavailable or prone to errors. Network security is meeting an organization's essential need for network availability, integrity, and confidentiality. The data transmitted through the network is protected from modification (either accidental or intentional), it cannot be read by unauthorized parties, and its source and destination can be verified (nonrepudiation). Business and security requirements are as follows:
Network stability and reliability
Confidentiality or nonrepudiation
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