| 摘要 |
A single protocol is used by sending systems to inform receiving systems what kind of data is arriving after the notification by this prefix protocol. The payload protocol follows, and is the real protocol that is used to exchange the data after the prefix protocol session. Although the PPP protocol allowed a negotiation of the used network protocol in the NCP, the PPP enforced that payload protocol data would always be carried inside HDLC framing. The payload protocol can be any protocol, and is only notified by prefix protocol HDLC frames, and therefore payload protocol data can be transferred inside any kind of protocol that is supported by a handler within the receiving system.
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