IPv6 The Internet is undergoing a fundamental architectural change as its core network layer protocol, Internet Protocol version 4 (IPv4), is replaced by Internet Protocol version 6 (IPv6).
these basic switches conform to the Open Systems Interconnection layer 2 protocol and operate as fast bridges, meaning they are transparent to network layer protocols
After the link has been established, PPP provides for an optional Authentication phase before proceeding to the Network-Layer Protocol phase.
链路建立之后,PPP提供可选的认证阶段,可以在进入 NLP阶段之前实行认证。
A Challenge packet MAY also be transmitted at any time during the Network-Layer Protocol phase to ensure that the connection has not been altered.
为了确保连接没有被更改,挑战包也可以在NLP阶段的任何时候发送。
Table 1 represents fields in a full header corresponding to network layer protocols IP, UDP, IP.
表1表示对应于网络层协议IP、UDP、IP的全标题中的字段。
Solving the third problem is often related to network-layer protocol considerations because the act of supplying a new IP address depends on being able to prove that one is authorized to receive it.
IPCP packets may not be exchanged until PPP has reached the Network-Layer Protocol phase, and any IPCP packets received before this phase is reached should be silently discarded.
There is an inbuilt assumption in the proposals that IPng is intended to be a universal protocol: that is, that the same network- layer protocol will be used between hosts on the same LAN, between hosts and routers, between routers in the same domain, and between routers in different domains.
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