"Cisco Secure Virtual Private Networks" by Andrew Mason is based on the official training course of the same name,...
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and gives you the knowledge to plan, administer, and maintain a VPN. This excerpt defines the types of VPNs and explores fundamental Internet Protocol Security (IPsec) technologies, as well as covering IPsec crypto components, an Internet Key Encryption (IKE) overview, how IPsec works, and IPsec security associations.
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