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Point-to-Point Protocol (PPP) is the standard for data link layer connectivity over serial links because its core protocols provide a solid operational foundation, as you saw in Chapter 10. However, PPP's popularity is based not just on its highly capable link establishment and management features, but it also has a number of very useful features that provide important security and performance benefits to network users.

In this chapter, I describe the protocols that implement several of the most common extra features in PPP. I begin with a discussion of PPP link quality monitoring. I describe the sets of protocols ...

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