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COMP/ELEC 429 Introduction to Computer Networks

This course provides a comprehensive overview of computer networks, focusing on the Internet's architecture, operation, and associated challenges. Topics include the evolution of networking technologies, important milestones in Internet history, and an exploration of how the Internet works, its security weaknesses, and innovative problem-solving strategies. Students will engage in discussions, collaborative activities, and hands-on learning to comprehend the mechanics of networked systems while fostering critical thinking skills essential for future advancements in networking.

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COMP/ELEC 429 Introduction to Computer Networks

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  1. COMP/ELEC 429Introduction to Computer Networks Overview Some slides used with permissions from Edward W. Knightly, Ion Stoica, Hui Zhang

  2. A bit about me... • Grew up in Hong Kong • B.S. University of Washington (Seattle) • Ph.D. Carnegie Mellon University (Pittsburgh) • Research interests in networked systems • Teach courses related to computer networks at both undergraduate and graduate levels • CS Graduate Committee Chair

  3. The BOLD Project in the News

  4. A bit more about me... • Love cycling, but don’t have much time for it anymore... • Besides teaching, research, administrative work, and other professional obligations...

  5. I’m Curious: What Motivated You to Take 429? • Introduce yourself to your neighbor • Interview neighbor on what motivated him/her to take 429?

  6. Obviously Internet Makes These Possible...

  7. Internet Remains Unreliable August 13!!

  8. Internet Remains Insecure

  9. Problems are Numerous! YouTube traffic mis-routed to Pakistan 1000s of Netherlands DSL customers lost service due to network configuration error CTBC (Brazil) black-holed all Internet traffic in some parts of Brazil Supro (Czech) routing messages triggered a Cisco router bug world-wide Source: Akamai Technologies, Inc.

  10. Course Goals • Understand how the Internet works • Understand how to utilize it • Understand its weaknesses • Understand alternatives • Become equipped to innovate, solve problems, do great things

  11. Long before there were computers... • 1876: Alexander Bell invented telephone • 1878: Public switches installed at New Haven and San Francisco, public switched telephone network is born • People can talk without being on the same wire! Without Switch With Switch

  12. The Advent of Computer Technology 1940s • Different networking requirements • Computers to computers communication • vs. communication between human beings • Digital information, discrete messages • vs. continuous analog voice • Circuit switching technique in telephone network hugely inefficient for computer communications

  13. dial-up MIT TX-2 SDC Q32 Major Internet Milestones • 1960-1964 Basic concept of “packet switching” was independently developed by Paul Baran (RAND), Leonard Kleinrock (MIT) • AT&T insisted that packet switching would never work! • 1965 First time two computers talked to each other using packets (Roberts, MIT; Marill, System Development Corp (SDC))

  14. Major Internet Milestones • 1968 BBN group proposed to use Honeywell 516 mini-computers for the Interface Message Processors (i.e. packet switches) • 1969 The first ARPANET message transmitted between UCLA (Kleinrock) and SRI (Engelbart) • We sent an “L”, did you get the “L”? Yep! • We sent an “O”, did you get the “O”? Yep! • We sent a “G”, did you get the “G”? Crash!

  15. Major Internet Milestones • 1970 First packet radio network ALOHANET (Abramson, U Hawaii) • 1973 Ethernet invented (Metcalfe, Xerox PARC) • 1974 “A protocol for Packet Network Interconnection” published by Cerf and Kahn • First internetworking protocol TCP

  16. Bob Kahn Vint Cerf The 2004 A. M. Turing Award Goes to... • "For pioneering work on internetworking, including the design and implementation of the Internet's basic communications protocols, TCP/IP, and for inspired leadership in networking.”

  17. Major Internet Milestones • 1977 First TCP operation over ARPANET, Packet Radio Net, and SATNET • 1985 NSF commissions NSFNET backbone • 1991 NSF opens Internet to commercial use

  18. Network Component Examples Links Interfaces Switches/routers Ethernet WiFi

  19. Commercial Internet after 1994 Joe's Company Regional ISP Campus Network Sprint Verizon NSF Network Rice NSF Network AT&T IBM

  20. Design Philosophy of the DARPA Internet Protocolsby David D. Clark (1988) • Internet communication must continue despite loss of networks or gateways • The Internet must support multiple types of communications service • The Internet architecture must accommodate a variety of networks • The Internet architecture must permit distributed management of its resources • The Internet architecture must be cost effective • The Internet architecture must permit host attachment with a low level of effort • The resources used in the Internet architecture must be accountable

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