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CyC2018 2018-12-30 17:39:29 +08:00
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docs/notes/计算机网络.md
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@ -175,7 +175,7 @@ TCP/IP 体系结构不严格遵循 OSI 分层概念，应用层可能会直接
模拟信号是连续的信号，数字信号是离散的信号。带通调制把数字信号转换为模拟信号。
<div align="center"> <img src="pics/f0a31c04-6e26-408c-8395-88f4e2ae928b.jpg"/> </div><br>
<div align="center"> <img src="pics/c34f4503-f62c-4043-9dc6-3e03288657df.jpg" width="500"/> </div><br>
# 三、数据链路层
@ -185,7 +185,7 @@ TCP/IP 体系结构不严格遵循 OSI 分层概念，应用层可能会直接
将网络层传下来的分组添加首部和尾部，用于标记帧的开始和结束。
<div align="center"> <img src="pics/ea5f3efe-d5e6-499b-b278-9e898af61257.jpg" width="500"/> </div><br>
<div align="center"> <img src="pics/9c60793f-5e7f-453b-8413-35890c24abc4.png" width="500"/> </div><br>
### 2. 透明传输
@ -193,7 +193,7 @@ TCP/IP 体系结构不严格遵循 OSI 分层概念，应用层可能会直接
帧使用首部和尾部进行定界，如果帧的数据部分含有和首部尾部相同的内容，那么帧的开始和结束位置就会被错误的判定。需要在数据部分出现首部尾部相同的内容前面插入转义字符。如果数据部分出现转义字符，那么就在转义字符前面再加个转义字符。在接收端进行处理之后可以还原出原始数据。这个过程透明传输的内容是转义字符，用户察觉不到转义字符的存在。
<div align="center"> <img src="pics/c5022dd3-be22-4250-b9f6-38ae984a04d7.jpg" width="600"/> </div><br>
<div align="center"> <img src="pics/839207f5-52fd-4516-9370-956dcdf2c2b5.png" width="600"/> </div><br>
### 3. 差错检测