In this chapter, you learned about security design principles with a focus on the following topics:

■ The need for network security, including business and legal requirements

■ The threats to network security, including reconnaissance, unauthorized access, and DoS

■ Security risks, including a breach of data confidentiality or integrity, and system and data availability interruptions

■ Network security policies and process

■ Calculating risk indices

■ The Cisco Self-Defending Network, including three critical elements: trust and identity management, threat defense, and secure connectivity

■ Security management

■ How security is integrated in Cisco network devices

■ How security solutions are deployed in the Enterprise network

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