Page 11CS 268: Graduate Computer Networks – Spring 2005Instructors:- Scott Shenker ([email protected], 683 Soda Hall)- Ion Stoica ([email protected], 645 Soda Hall)Lecture time: MW, 2:30-4:00 amPlace: 405 Soda HallOffice hour: tba2OverviewAdministrative triviaOverview and history of the InternetA Taxonomy of Communication Networks3Administrative Trivia’sCourse Web page: - http://www.cs.berkeley.edu/~istoica/cs268/05/ (check it by tomorrow)- Check it periodically to get the latest informationDeadlines- Unless otherwise specified, it means 10 minutes before the lecture- Special circumstances should be brought to our attention ahead of deadlines4Goals of this CourseUnderstand - How does the Internet work?- What are the Internet’s design principles? - Where is the Internet heading to?Get familiar with current Internet research effortsUnderstand solutions in context- Goals- Assumptions5Goals of this Course (cont’d)Appreciate what is good research- Problem selection- Solution & research methodology- PresentationApply what you learned in a class project6What Do You Need To Do?A research-oriented class projectTwo examsPaper readingOne 20min paper presentationPage 27Research ProjectInvestigate new ideas and solutions in a class research project- Define the problem- Execute the research- Work with your partner - Write up and present your researchIdeally, best projects will become conference papers (e.g., SIGCOMM, INFOCOM, MOBICOM)8Research Project: StepsWe’ll distribute a list of projects- You can either choose one of these projects or come up with your ownPick your project, partner, and submit a one page proposal describing:- The problem you are solving - Your plan of attack with milestones and dates- Any special resources you may needA midterm presentation of your progress (five minutes)Poster session Submit project papers9Paper ReviewsGoal: synthesize main ideas and concepts in the papersNumber: around two papers per classLength: no more than half page per paperContent- Main points intended by the author- Points you particularly liked/disliked- Other comments (writing, conclusions…) Submission:- Submit each review via e-mail before the class on lecture day- See class web page for details10GradingThis is a graduate networking class: more important is what you realize/learn than the grade10%Paper reviews15%Class participation and presentation15%Midterm exam10%Midterm exam50%Term project11Enrollment PolicyGraduate students get highest priorityAmong other students, priority is given to those who - Have backgrounds in networking, operating systems- Have relatively light course loadProcedure of enrollment for undergraduate students- Be officially on the waiting list- Send us an email with URL that has pointers to• Your resume or cv• A short statement of relevant courses (textbook, university, grade) and experiences• Other courses you are taking this semester12Send the Following InformationPlease send me ([email protected] ) an e-mail with the subject “cs268 registration" and the following information: - Last and first name - Student ID - Your department - Preferred email address - URL of your home pagePage 313OverviewAdministrative triviaOverview and history of the InternetA Taxonomy of Communication Networks14The Internet (cont’d)Global scale, general purpose, heterogeneous-technologies, public, computer networkInternet Protocol- Open standard: Internet Engineering Task Force (IETF) as standard body ( http://www.ietf.org)- Technical basis for other types of networks• Intranet: enterprise IP networkDeveloped by the research community15History of the Internet70’s: started as a research project, 56 kbps, < 100 computers80-83: ARPANET and MILNET split, 85-86: NSF builds NSFNET as backbone, links 6 Supercomputer centers, 1.5 Mbps, 10,000 computers87-90: link regional networks, NSI (NASA), ESNet(DOE), DARTnet, TWBNet (DARPA), 100,000 computers90-92: NSFNET moves to 45 Mbps, 16 mid-level networks94: NSF backbone dismantled, multiple private backbonesToday: backbones run at >10 Gbps, >200 millions computers in 150 countries16Time Line of the Internet•Source: Internet Society17Growth of the InternetNumber of Hosts on the Internet:Aug. 1981 213Oct. 1984 1,024Dec. 1987 28,174 Oct. 1990 313,000 Oct. 1993 2,056,000Apr. 1995 5,706,000Jan. 1997 16,146,000Jan. 1999 56,218,000Jan. 2001 109,374,000Jan. 2003 171,638,297July 2004 285,139,10711010010001000010000010000001000000010000000010000000001981 1985 1989 1993 1997 2001Data available at: http://www.isc.org/18Page 419Services Provided by the InternetShared access to computing resources- Telnet (1970’s)Shared access to data/files- FTP, NFS, AFS (1980’s)Communication medium over which people interact- Email (1980’s), on-line chat rooms (1990’s)- Instant messaging, IP Telephony (2000’s)A medium for information dissemination- USENET (1980’s)- WWW (1990’s)• Replacing newspaper, magazine- Audio, video (2000’s): peer-to-peer systems• Replacing radio, telephony, TV 20OverviewAdministrative triviaOverview and history of the InternetA Taxonomy of Communication Networks21Communication networks can be classified based on the way in which the nodes exchange information:A Taxonomy of Communication NetworksCommunication NetworkSwitchedCommunication NetworkBroadcastCommunication NetworkCircuit-SwitchedCommunication NetworkPacket-SwitchedCommunication NetworkDatagramNetworkVirtual Circuit Network22Broadcast communication networks- Information transmitted by any node is received by every other node in the network• E.g., LANs (Ethernet, Wavelan) - Problem: coordinate the access of all nodes to the shared communication medium (Multiple Access Problem)Switched communication networks- Information is transmitted to a sub-set of designated nodes• E.g., WANs (Telephony Network, Internet)- Problem: how to forward information to intended node(s)• Done by special nodes (e.g., routers, switches) running routing protocols Broadcast vs. Switched Communication Networks 23Communication networks can be classified based on the way in which the nodes exchange information:A Taxonomy of Communication NetworksCommunication NetworkSwitchedCommunication
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