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Network Security First-Step, Second Edition by Donald Stoddard, Thomas M. Thomas

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AAA Technologies

Today, we live in a world in which almost everything must be protected from misuse and nothing is free. It does not matter whether you are a system administrator, manager, student, or a network engineer. If you access services via a network, you always need three things:

Authentication

Authorization

Accounting

These components are collectively known as AAA (Commonly referred to as Triple A). As discussed in the following sections, each of these components plays an important role.

Authentication

Authentication ensures that the network’s users are who they claim to be. This is important because you do not want these people accessing the network if they are not supposed to. Usually a shared secret or a trusted third-party ...

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