1.2 Purpose and Scope This publication seeks to assist organizations in mitigating the risks associated with the transmission of sensitive information across networks by providing practical guidance on implementing security services based on Internet Protocol Security (IPsec). This document presents information that is independent of particular hardware platforms, operating systems, and applications, other than providing real-world examples to illustrate particular concepts. Specifically, the document includes a discussion of the need for network layer security services, a description of the types of services that are offered at the network layer, and how IPsec addresses these services. It uses a case-based approach to show how IPsec can be used to solve common network security issues. It also describes alternatives to IPsec and discusses under what circumstances each alternative may be appropriate
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