通信方式
根据信息在传输线上的传送方向，分为以下三种通信方式：
- 单工通信：单向传输
- 半双工通信：双向交替传输
- 全双工通信：双向同时传输
带通调制
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。
参考链接
- 计算机网络, 谢希仁
- JamesF.Kurose, KeithW.Ross, 库罗斯, 等. 计算机网络: 自顶向下方法 [M]. 机械工业出版社, 2014.
- W.RichardStevens. TCP/IP 详解. 卷 1, 协议 [M]. 机械工业出版社, 2006.
- Active vs Passive FTP Mode: Which One is More Secure?
- Active and Passive FTP Transfers Defined - KB Article #1138
- Traceroute
- ping
- How DHCP works and DHCP Interview Questions and Answers
- What is process of DORA in DHCP?
- What is DHCP Server ?
- Tackling emissions targets in Tokyo
- What does my ISP know when I use Tor?
- Technology-Computer Networking[1]-Computer Networks and the Internet
- P2P 网络概述.
- Circuit Switching (a) Circuit switching. (b) Packet switching.
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