Chapter 1. Introduction to Remote Access VPN Technologies

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IPsec

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SSL VPN

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L2TP

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L2TP over IPsec

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PPTP

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Since the advent of the Internet, network administrators have looked for ways to leverage this low-cost, widespread medium to transport data while protecting data integrity and confidentiality. They looked for ways to protect the information within the data packets while providing transparency to the end user. This spawned the concept of Virtual Private Networks (VPN). Subsequently, the Internet Engineering Task Force (IETF) was engaged to craft standard protocols ...

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