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…

一 War Time Computing and Communication 讲到电子计算机,你不得不提起第二次世界大战,虽说二战是人类历史上史无前例的大灾难,不过从某种程度来说,它确实促进了社会的发展和进步 通信对于战争来说是极其重要的,谁掌握了通信谁就掌握了战争的先机.而二战所涉及的范围和地域是极广的,横跨了几大洲,几大洋,所以这意味着通信必须是无线的.可是无线即有一个问题,信号可能被截获从而导致情报泄露,情报泄露的对于战争来说可是致命的.因此给信号加密似乎成为了各国所追寻的趋势.密码学,和…

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…

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…

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…

Week 6 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 cover…

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…

Hiding Date from Ohters Security Introduction Alice and Bob是密码学.博弈论.物理学等领域中的通用角色之一.Alice(代表A)和Bob(代表B)一般是形容好人的,用来描述通讯双方.通讯中也会出现一些不怀好意的人(People with bad intent),比如窃听者(Eve),用E代表. Security is Always a Tradeoff,安全总是一种充满妥协的权衡.对于安全这回事,几乎不存在所谓的Perfect Secur…

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…

Week7 With reliable "pipes" available from the Transport layer, we can build applications like web browsers, file transfer applications, or email clients and servers. Technology: Application Protocols coursera address Layer 4: Applications Keywo…

Week5 The Transport layer is built on the Internetwork layer and is what makes our network connections reliable. Technology: Internets and Packets 新年好!(￣▽￣) coursera address Layer1: Link Keywords: Packet, Shared Network, Layered Network Model, Link L…

Week 5 Technology: Internets and Packets Welcome to Week 5! This week, we'll be covering internets and packets. The Internet is designed based on a four-layer model. Each layer builds on the layers below it. The Link and Internetwork layers are the l…

Week5 Technology: Internets and Packets Welcome to Week 5! This week, we’ll be covering internets and packets. The Internet is designed based on a four-layer model. Each layer builds on the layers below it. The Link and Internetwork layers are the lo…

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…

Week ⑨ 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, we'll be covering web…

Week4. We are now moving into Week 4! This week, we will be covering commercialization and growth. The late 1990's saw the web and Internet used increasingly to revolutionize how business was done. Companies like Amazon were founded and grew very rap…

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,…

Week 7 Technology: Application Protocols Welcome to Week 7 of IHTS. This week has less material than other weeks. I like to think of it as a "seventh inning stretch" - where you get a little breather. This week wraps up the three weeks of "…

Week 4 History: Commercialization and Growth We are now moving into Week 4! This week, we will be covering commercialization and growth. The late 1990's saw the web and Internet used increasingly to revolutionize how business was done. Companies like…

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…

Layer 4: Applications Application Layer TCP提供了“a reliable pipe”(一个坚固的水管)连接用户和服务器,确保了数据能准确不出意外地传输,所以Application Layer(应用层)可以不考虑底层技术细节,转而去实现一些具体的应用功能. Application Layer有两个基本问题: 首先是应用如何得到数据,答案是Ports(端口) 其次是应用遵循怎样的规则运转,答案是Protocols(协议) Ports(端口)跟在IP地址后面,…

Week 8 This week we start two weeks of Internet Security. It is a little technical but don't worry - we stay at a very high level and I am confident that if you are still keeping up with the class that you will enjoy these next two weeks. You won't k…

Week5 Now, I want to make it real clear that, when I give you a 15 minute video of an amazing inventor and computer scientist, you don't have to remember every word that that person says. Okay? it's more important to get the gist of it. I try to cove…

Week3. Welcome to week 3! This is our fourth and final week of History where we make the connection from those early innovations of the modern Internet we are using for this class. Up next we move into looking at how the Internet works on the inside.…

Week 8 Security: Encrypting and Signing This week we start two weeks of Internet Security. It is a little technical but don't worry - we stay at a very high level and I am confident that if you are still keeping up with the class that you will enjoy…

Week 5 (续) Layer 2: Internet Protocol The InterNetwork (IP) 老师强调了一下不用去记住他介绍的人所说的每句话,而是记住要点,了解老师所做的PPT的内容,所以贴图介绍5-1最后的Ethernet的发明人Robert的基本介绍: 老师说只是想让我们知道smart people做cool的事,并不需要我们明白一切事= =(心情放松了一些).接下类讲Link Layer. 想象一下,大约又20000~50000名工程师花了将近20年时间来指出如何…

Week 3 History: The Web Makes it Easy to Use Welcome to week 3! This is our fourth and final week of History where we make the connection from those early innovations of the modern Internet we are using for this class. Up next we move into looking at…

前言: 之前都在学习Internet的历史,从这周开始,进入到了Internet技术的学习. Layer1: Link Introduction / The Link Layer 80年代之前,主流网络的还是Store and Forward Networking(存储转发网络),但是由于其在数据处理方面延时较大,无法应用于条件严苛的军事领域,故军方出力研究出了ARPANET——一个典型的packet switch network(分组交换网络). ARPANET给出了一个不一样的网络:Shar…

前言: 上周学习了<电子计算机的曙光>,对战时及战后的计算机的历史发展有了更丰富的了解,今天继续coursera的课程,感觉已经有点适应了课程的节奏(除了经常有些奇奇怪怪的词汇看都看不懂@#￥%),嗯. Supercomputers Justify a National Network: History Through Supercomputing 70年代开始的时候,只有少数幸运的人才能用上电传打字机,就像视频中使用的一样.那时候的数据传输还依靠leased line(租用线路)来实现,和拨…