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4.1 | PPP |
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4.1.3 | PPP layer functions |
PPP uses a layered architecture, as
shown in the Figure. With its
lower-level functions, PPP can use:
With its higher-level functions, PPP supports or encapsulates several network-layer protocols with NCPs. These higher-layer protocols include the following:
These are functional fields containing standardized codes to indicate the network-layer protocol type that PPP encapsulates.
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