Week6 The Internet is desinged based on four-layer model. Each layer builds on the layers below it. The Link and Internetwork layers are the lowest layers of that model. Technology: Transport Control Protocol(TCP) coursera address Transport/Reliabili…

Abstract 课程名称:互联网的历史.技术和安全 coursera地址 制作方:密歇根大学(University of Michigan) 教师:Charles Severance, Associate Professor, School of information coursera页面: 以下是渣翻译 课程简介:技术和网络对我们生活,文化,和社会的影响继续增加.过去的六十年,得益于网络设施的基础建设,你可以在任何有网络的地方选修这门课.在一个以信息为中心的世界,我们需要了解网络技术的工作…

Internet History,Technology and Security(简单记录) First Week High Stakes Research in Computing,and Communication 二战期间,需要有效快速的方式联系盟国,进而意味着通信方式需要便捷以及快速. 但是无线通信难以物理隐藏,需要利用code(应该是密码)来加密解密,也就产生了相应的计算需求,数学则是其中重要的工具. 为了破解这类code,选择借助于计算机,从最早的机械计算机(mechanical c…

时间飞逝,一周又过去了,这周我们来到了Internet History, Technology and Security (Week 2)的学习,从标题就可以看出,这周主要是介绍“互联网”雏形的诞生.Supercomputers Justify a National Network”介绍了网络诞生的背景和网络的发展.“The First ‘Internet’”则通过三位与其相关的知名人物从不同的角度来讲述早期网络诞生背后的故事 History Through Supercomputing 在美国…

课程网址:https://www.coursera.org/learn/internet-history 学习笔记: Week 1: History - Dawn of Early Computing (1940 - 1960) War Time Computing and Conmmunication - High Stakes Research in Computing, and Communication 二战刺激了政府对各种科技的研究投入,由此促进了计算机技术的发展,其中就包括电子计算机…

Week 2 History: The First Internet - NSFNet Welcome to week 2! This week, we'll be covering the history of the first internet: NSFnet. In the 1960s and 1970s, there was a great deal of research done to build the first wide-area packet switched networ…

Week 9 Security: Web Security We are now on the second to last week of the class and finishing up our look at Internet Security. You can also see the final exam and its due date. The due date of the final exam signals the end of the class. This week,…

Week6 Technology: Transport Control Protocol(TCP) Welcome to Week 6 of IHTS. We are in our second week of the more technical bits of the course. I try to keep the technical bits interesting and not go into too much detail.This week, we’ll be covering…

前言: 这周开始学习分层网络模型的第三层,传输层. Transport/Reliability: Transport Layer TCP层的目的是补偿IP层中可能出现的错误,并充分利用可用资源.由于IP层是有可能丢失数据的,因此TCP层会保存一份数据拷贝,不断的重发数据包直到收到确认应答,如果耗时太长(hop数过多),也将重新发送. TCP的原理大致是这样的:数据在传输数据时会分成很多个packets(包),分开发送.我们不断地重复发送过程直到从目的端收到acknowledgement(确认回复…

前言: 第一次进行课程学习,在反复观看视频和查找字典翻译理解后选出了视频中个人认为较重要的概念,以下并不按照逐句翻译,中文概括大意余下自由发挥,对老师想要告诉我们的历史有一个初步的了解,顺便锻炼以下英文阅读理解能力...... War Time Computing and Communication: High Stakes Research in Computing, and Communication We're going to start at the dawn of electroni…