1. EEC-584 Computer Networks Lecture 1 Wenbing Zhao wenbing@ieee.org (Lecture nodes are based on materials supplied by Dr. Louise Moser at UCSB and Prentice-Hall)

2. 2 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Instructor/TA Information Instructor: Dr. Wenbing Zhao –Office: SH434 –Email: wenbing@ieee.orgwenbing@ieee.org –Lecture: MW 6:00-7:50pm, SH306 –Office hours: M W 4:00-6:00pm and by appointment TA: Rajamani Aravinda Bhadriraju –Office:SH307 –E-mail: –Office hours: T Th 2:00-4:00pm and by appointment

3. 3 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao What is Computer Network? A group of computers inter-connected together Local Area Network

4. 4 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao What is Computer Network? A group of computer inter-connected together Wide Area Network

5. 5 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao What are the Elements in a Computer Network? Hosts – computers Communication medium – cables, wireless medium (EM waves) Routers – forward a packet from one place to another, decide on a path from source to destination Protocols – rules governing the communication

6. 6 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Achieving Connectivity is Not Easy Layered approach We will study the issues in each layer in a hybrid order –Application –Physical –Link –Network –Transport application transport network link physical Transport Service Provider Transport Service User

7. 7 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Course Objectives Good understanding of the computer networking technologies –How connectivity is achieved? Hands on experience –Labs: observe how protocols work –Project: implement a protocol

8. 8 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Prerequisite Officially: graduate standing Actually: I assume you have sufficient computer engineering background –You have taken undergraduate-level operating systems, data structure and algorithms, and programming language courses. –In particular, the course project involves with programming in Java

9. 9 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Topics Overview of computer networks –Types of computer networks –Reference models –Protocols, services and interfaces –Circuit switched vs. packet switched –Connection oriented vs. connectionless

10. 10 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Topics Application Layer –HyperText Transfer Protocol (HTTP) –Domain Name Service (DNS) –FTP, Email Physical Layer –Main service: communicate bit streams over wired or wireless medium –Theoretical basis for data communication

11. 11 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Topics Data Link Layer –Main service: provide point-to-point single hop communication service to higher layer –Framing: group bits together –Error control –Flow control

12. 12 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Topics Data Link Layer –Basic communication protocols –Medium access control protocols

13. 13 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Topics Network layer –Main service: routing over multiple hops –Routing algorithms –Internet Protocol (IP) –IP address allocation –Internet Control Protocols: ICMP, ARP, DHCP

14. 14 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Topics Transport layer –Main service: End-to-end reliable communication –User Datagram Protocol (UDP) –Transport Control Protocol (TCP)

15. 15 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Labs Purpose: Observe how protocols work Tools used: Ethereal 6 labs –HTTP –DNS –Ethernet –DHCP –IP & ICMP –TCP “Tell me and I forget. Show me and I remember. Involve me and I understand.” - Chinese proverb Lab instructions taken from Kurose’s book

16. 16 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Labs Lab sessions are mandatory unless an exception is granted in advance I will not accept the lab report if you do now show up during the lab session

17. 17 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Project Implementation of a link-state routing algorithm Single person or two-person team Deliverables for each project –Project report describing design, implementation, user’s guide for your program, and performance measurement results –Fully commented source code –Test input and output data –Demonstration and possibly code review

18. 18 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Project For the course project, I will provide –Project description –Java skeletal code for you to start with –A binary jar file of a reference implementation –Possibly test programs as well If you choose to use a different language, you are on your own. Sorry

19. 19 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Class Participation 10% of the course credit In general, there is a mock quiz in the beginning of each lecture, so that –I know who is here & I get feedback for my teaching To obtain the full credit for class participation, you must satisfy ALL of the following conditions: –You do not miss more than 2 lectures –You do not miss any quiz and lab sessions –You asked at least 10 questions during the semester You will lose all 10% credit if you miss more than 6 lectures/labs

20. 20 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Class Participation Send me an email with the following information for each question you have asked within 24 hours after each lecture: –The question you asked –My response –Your comment on my response and suggestion for improvement, if any

21. 21 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Class Participation You are also encouraged to give me advice/suggestions on how you would like me to improve my teaching to make it more conducive For each piece of advice/suggestion, it will be counted as 2 questions

22. 22 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Quizzes 4 quizzes. Basically one quiz for each layer, except quiz #1 Each quiz lasts about 1 hour The quizzes are closed book and closed notes, except that you are allowed to bring with you a one-page cheat sheet no larger than the US letter size (double-sided allowed)

23. 23 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Quizzes No makeup quizzes! No midterms and final exam

24. 24 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Grading Class participation 10% Quizzes 40% Labs 20% Project 30% Grading scale: –A: 90-100% –A-: 85-89% –B+: 70-84% –B: 60-69% –B-: 55-59% –C: 50-54% –F: <50%

25. 25 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Do not cheat! Do not copy other student ’ s lab report, quizzes or projects Do not copy someone else ’ s work found on the Internet –Including project implementation and report –You can quote a sentence or two, but put those in quote and give reference –You can build your projects on top of open source libraries, but again, you need to explicitly give acknowledgement and state clearly which parts are implemented by you

26. 26 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Consequences for Cheating You get 0 credit for the project/lab/quiz that you have cheated If the task is worth more than 25% of the course, it is considered a major infraction Otherwise, it is considered a minor infraction

27. 27 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Consequences for Cheating For major infraction and repeated minor infractions –You will get an F grade, and –You may be suspended or repulsed from CSU CSU Code of Conduct –http://www.csuohio.edu/studentlife/conduct/StudentC odeOfConduct2004.pdfhttp://www.csuohio.edu/studentlife/conduct/StudentC odeOfConduct2004.pdf

28. 28 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Reference Texts Andrew S. Tanenbaum : –Computer Networks 4th Edition, Prentice-Hall, 2003 James F. Kurose, Keith W. Ross, –Computer Networking: A Top-Down Approach Featuring the Internet 3 rd Edition, Addison-Wesley, 2004

29. 29 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Additional Information Anonymous email: –teachingcsu@gmail.comteachingcsu@gmail.com –Password: –if you are not happy, please do let me know Course Web site: –http://academic.csuohio.edu/zhao_w/teaching/EEC58 4-S07/eec584.htmhttp://academic.csuohio.edu/zhao_w/teaching/EEC58 4-S07/eec584.htm –Lecture notes and project instruction will be posted

30. 30 Spring 2007EEC-484/584: Computer NetworksWenbing Zhao Homework Due Jan 17, 11:59pm (today midnight!) Email me the following information –The amount of time per week you commit to this course –The grade you expect to get –If your schedule conflicts with my office hours, what is the best time for you to talk to me? –Any topics you are most interested in but not listed, if any –Comments and suggestions, if any