CSc 450/550 Computer Networks Introduction. Jianping Pan Summer 2007

Transcription

1 Computer Networks Introduction Jianping Pan Summer

2 About the course Computer Communications and Networks lectures: MR 11:30am - 1pm, MAC D116 lectures, labs, discussion board, etc prerequisites (from UVic calendar) Computer organization (CSc 355) Operating systems (CSc 360) CSc 360 prereq: CSc 225, 230, SENG 265 2

3 What's new this summer? The course in the process of redesign and redevelopment The lectures focus on TCP/IP networking a foundation for the advanced networks courses new! guest lecture: May 10 by Mr Ron Kozsan The labs new! Ethereal (Wireshack) tutorials focus on TCP/IP networking 3

4 About the course instructor Dr Jianping Pan x5796 office hours: MR 10:30-11:30am, ECS566 or by appointments work experience UVic, industry research labs, UWaterloo, research area computer networks and distributed systems 4

5 About the lab instructors Deer (Dale) Li Ming Lu Two sections! check WebTT for your lab time/place Three lab projects lab starts this week! 5

6 Why study computer networks? How to use networks not as a network user but as a network programmer/engineer! configure, diagnose, troubleshoot, improve networks How to design network protocols or design any large-scale, distributed systems How to implement network protocols or write any effective and efficient code 6

7 Internet history: ARPAnet (70 s) Dec March 1971 July 1970 Apr Sep Kbps 7

8 Internet history: NSFnet (80 s) Mbps 8

9 The Internet T1/T3 OC12/48/192 satellite Dialup DSL Cable wireless Ethernet FDDI leased wireless data center 9

10 AT&T US backbone 10

11 Internet Service Providers 11

12 Internet in Canada CA*net: ; CANARIE: Kbps, T1 (1.5Mbps), T3 (45Mbps) CA*net II: national test network: ATM (155Mbps) CA*net 3: the world s first national optical R&E network CA*net 4: 2002-now high-speed optical network (40Gbps) 12

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14 UVic UVicNet: Gigabit Ethernet backbone switched 10/100Mbps Ethernet access also, UVic research network ResNet: switched 10Mbps Ethernet UVic AirNet: 11Mbps wireless LAN Upstream providers BCnet ORAN: CA*net4 VicTX: commercial Internet 14

15 UVic => Google # traceroute google.com traceroute: Warning: google.com has multiple addresses; using traceroute to google.com ( ), 30 hops max, 38 byte packets 1 gw.net.engr.uvic.ca ( ) ms ms ms... 5 csc1cled050.bb.uvic.ca ( ) ms ms ms... 8 UVicB-Policy1.VICTX.BC.net ( ) ms ms ra1cv-ge gv.bigpipeinc.com ( ) ms ms rc1wt-pos2-1.wa.shawcable.net ( ) ms ms six.sea01.google.com ( ) ms ms ms ( ) ms ms ms ( ) ms ms ms 15

16 How to study computer networks? The design and implementation of protocols algorithms: error checking, sliding window, etc mechanisms: flow, error, congestion control, etc policies: e.g., reliable vs unreliable data transfer Protocols: the machine-to-machine language syntax: how do you do? semantics: what do you mean by how do you... synchronization: the sequence of conversation 16

17 Google! # wget -d Connecting to Caching <-> Created fd 3. connected! ---request begin--get / HTTP/1.0 User-Agent: Wget/1.7 Host: Accept: */* Connection: Keep-Alive ---request end--http request sent, awaiting response... HTTP/ Found Location: Cache-Control: private Content-Type: text/html Server: GWS/2.1 Content-Length: 218 client server request response 17

18 Things involved You say I say Domain Name System (DNS) User Datagram Protocol (UDP) connected Transmission Control Protocol (TCP) Internet Protocol (IP) request begin Hyper Text Transfer Protocol (HTTP) 18

19 More things involved TCP connection management flow, error, and congestion control IP Internet addressing and routing Link layer Ethernet: IEEE wireless Ethernet: IEEE

20 Course objectives Understand the principles and practice of designing, building, and operating computer networks, particularly the Internet. Selected topics application layer: client-server, HTTP, DNS transport layer: TCP, UDP network layer: IP, Internet routing link layer: IEEE 802.3, IEEE

21 Course materials Required textbook Tanenbaum, Computer networks, 4th edition Kurose & Ross Computer networking, a topdown approach featuring the Internet, 3rd edition (4th edition is out!) Explore further web course web site IETF, ACM, IEEE,..., Google! 21

22 Your participation Lectures Lab projects (CSc 450: 45%; 550: 30%) bonus features! Course projects (CSc 550: 15%) Exams (: 20%, 20%, 15%) three in-class midterms May 31, June 28, August 2 60-minute exam, 20-minute after-exam review 22

23 Suggested approaches Before lectures read textbook; find questions Attend lectures take notes; ask questions! After lectures explore further; get help and help others Attend lab tutorials start projects early! 23

24 Common mistakes The slides are already out there slides: intended to be brief and as a guide map a lot of details, discussion, questions and answers only appear in class attending lectures is essential I'll do the lab project on the due date simple fact: you cannot finish (and even start) it! design and implementation take a lot of time starting early is essential 24

25 More systems UVic Embedded systems (CSc 460) Multimedia systems (CSc 461) Distributed systems (CSc 462) Fault-tolerant (CSc 454) and Parallel (464) Topics in systems (CSc 485A-H) advanced operating systems advanced computer networks (offering now!) wireless mobile networks, etc 25

26 Your feedback Teaching/learning is interactive two-way communications Let me know what do you think about lectures, tutorials, labs, projects, exams, topics, what do you want to know more, probe further You can always reach me in class, during office hours, by /phone 26

27 Course policies See official course outline late assignments, mark appeals, etc academic integrity accommodation, etc No group projects collaboration/participation is encouraged responsibility: your submitted work is yours obligation: give credits to references 27

28 Assignment 0 Due on Friday, May 11th, 2007 From you@uvic.ca to pan@uvic.ca Subject: [csc450] A0, or [csc550] A0 name, student number, academic program things you want to know most in networks your research topics and projects (csc550 required) issues with course logistics a URL to a mug shot let me know you! 28

29 This lecture An introduction to the course who, when, where, what, and how course objectives, materials, topics you and the course! Explore further your traceroute to at home, or to your other favourite web sites on Windows, it's tracert anything interesting, unusual, confusing? 29

30 One more message... NSERC Undergraduate Research Awards awards allocated to UVic CS Fall 2007 application deadline: June 15 get a taste of doing research a good experience before graduation, going to graduate school, or committing to research career impress employers in your resume can be used as Co-op, work term as well some projects 30

31 Next lecture Guest lecture UVicNet, BCNET, CA*Net4 and more by Mr Ron Kozsan UVic Network Services Managers May 10, 11:30am-1pm, MAC D116 31