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CyC2018 2018-12-30 19:51:29 +08:00
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docs/notes/计算机网络.md
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@ -275,13 +275,13 @@ CSMA/CD 表示载波监听多点接入 / 碰撞检测。
当发生碰撞时，站点要停止发送，等待一段时间再发送。这个时间采用 **截断二进制指数退避算法** 来确定。从离散的整数集合 {0, 1, .., (2<sup>k</sup>-1)} 中随机取出一个数，记作 r，然后取 r 倍的争用期作为重传等待时间。
<div align="center"> <img src="pics/5aa82b89-f266-44da-887d-18f31f01d8ef.png" width="600"/> </div><br>
<div align="center"> <img src="pics/9bd12b89-f99c-49f4-ae45-410f76a713d6.png" width="500"/> </div><br>
## PPP 协议
互联网用户通常需要连接到某个 ISP 之后才能接入到互联网，PPP 协议是用户计算机和 ISP 进行通信时所使用的数据链路层协议。
<div align="center"> <img src="pics/ddcf2327-8d84-425d-8535-121a94bcb88d.jpg" width="600"/> </div><br>
<div align="center"> <img src="pics/2f237854-bb35-4c57-a7fe-ab2ab144f56e.jpg" width="300"/> </div><br>
PPP 的帧格式：
@ -290,7 +290,7 @@ PPP 的帧格式：
- FCS 字段是使用 CRC 的检验序列
- 信息部分的长度不超过 1500
<div align="center"> <img src="pics/69f16984-a66f-4288-82e4-79b4aa43e835.jpg" width="500"/> </div><br>
<div align="center"> <img src="pics/63010737-2cb4-48f3-999f-09194481b227.png" width="500"/> </div><br>
## MAC 地址