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1. End-to-End Principle 1.1 端到端原则v1： 通信系统设计的目标是将信息传输中发生错误的概论降低到一个可以接受的水平。 由于网络核心处的数据传输时不可靠的，因此数据的可靠性检验工作应该由端系统完成。 例子： 如图，假如数据检错的工作在数据链路上完成，如果D的内存出了问题， 阅读全文
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Unit 1 Review 1. What we learned? How an application uses the internaet. Thestructure of the Internet: The 4 layer model. The Internet protocol(IP): W 阅读全文
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Byte order 1. Endianness 2. Network Byte Order Different processors have different endianness Little endian: x86 Big endian: ARM To interoperate, they 阅读全文
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Packet Switching Principle 1. What is packet switching? Packet switching is the ideal that we break our data into discrete, self-contained chunks of d 阅读全文
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Networked Applications World Wide Web BitTorrent Skype ...... Layerd Internet Model Ineternet is a huge and complicated project, for simplifying the d 阅读全文