cs1101_09A_lec09 - CS1101 Lec09 Internet and WWW Dr. Jiying...

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CS1101 Lec09 -  Internet and  WWW Dr. Jiying Wang Semester A, 2009-10 Computer Science Department City University of Hong Kong
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CS1101 - Lec09 2 Objectives Briefly discuss the history of the Internet Draw a conceptual diagram illustrating the Internet backbone, NSP, ISP, and routers List various options to access and connect to the Internet Describe the TCP/IP protocol, and how router works Explain the relationship between IP addresses and domain names, and how DNS works List today's popular Internet services Discuss in details how browsers work and how cookies could help with user preference or  browsing interests Discuss new technologies that beyond HTML and the trend of Web 2.0 Describe how email and instant-messaging work
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CS1101 - Lec09 3 For you to practice after class Lec09-Q1:   note that when upstream speeds differ from downstream speeds, you have an asymmetric  Internet connection; when upstream and downstream speeds are the same, you have a symmetric  Internet connection. Most available Internet connection services, such as DSL and cable connection,  are asymmetric. Why this asymmetry is okay for most Internet users?  Lec09-Q2:  each node in the Internet already has a unique MAC address, why we still need to assign an  IP address to it? Lec09-Q3:  note in this Tracert command execution, it displays a "Request timed out" message at hop 8  and hop 9. Does it necessarily mean that hop 8 and hop9's system have problems?  Is there any other  reasons causing such time-out?
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CS1101 - Lec09 4 What is the Internet? The Internet  is an interconnected network  of thousands of local, regional,  national and international networks Connects computers to almost every country in the world Growing too fast to measure its growth Too decentralized to quantify A network with no hard boundaries
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CS1101 - Lec09 5 History of the Internet Networking project by Pentagon’s Advanced Research Projects Agency  (ARPANET) is the predecessor to the Internet: Launched in 1969 - Developed by the Department of Defense - Connected universities and defense bases Mid-1980s - Its peer-to-peer networking philosophy and protocols were copied to NSFnet, a  network between five "supercomputing centers" for academic research Early 1990s - ARPANET shut down - NSFnet abandoned - Commercial networks take over
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CS1101 - Lec09 6 Internet Infrastructure The main routes of the Internet are referred to as the  Internet backbone The Internet backbone consists of high-speed fiber-optic links connecting high- capacity routers or communication satellites Constructed and maintained by 
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This note was uploaded on 03/10/2012 for the course CS 1101 taught by Professor Drxue during the Spring '11 term at City University of Hong Kong.

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cs1101_09A_lec09 - CS1101 Lec09 Internet and WWW Dr. Jiying...

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