I I I I I I I I I I I I I I I I I I I 3 I I Table of Contents
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CSE 127 Computer Security Stefan Savage, Spring 2018, Lecture 16
CSE 127 Computer Security Stefan Savage, Spring 2018, Lecture 16 Network Security I Objectives ▪ Understand – Architecture of the Internet protocol suite (TCP/IP) ▪ CSE123 in 20mins – Common weaknesses in networking protocols – Available mitigations and their limitations Review: Internet Protocol Suite ▪ Application Layer – Examples: SMTP, FTP, SSH, HTTP, etc. ▪ Transport Layer: Port-addressed host-to-host communications (on LAN or WAN). – User Datagram Protocol (UDP): single packet transmission with no reliability or ordering mechanisms. – Transmission Control Protocol (TCP): connection establishment, reliable transmission, and flow-control. ▪ Internet Layer (IP): Fragmentation, reassembly, and end-to-end (across network boundaries) routing of data packets. – Provides a uniform interface that hides the underlying network topology. ▪ Link Layer: Transmission of data frames within a local network (without intervening routers). – Example: Ethernet ▪ Physical Layer: Transmission of raw bits (rather than logical data packets) over a physical data link connecting network nodes. – Example: 100BASE-T – [Technically not part of the Internet Protocol Model, but is still there] Review: Internet Protocol Suite https://en.wikipedia.org/wiki/Internet_protocol_suite Review: Internet Protocol Suite https://en.wikipedia.org/wiki/Internet_protocol_suite TCP/IP Protocol Stack by Example ▪ ROUGHLY, what happens when I click on a URL while UCSD’s network? My computer www.yahoo.com Application Layer (HTTP) ▪ Turn click into HTTP GET request GET http://www.yahoo.com/r/mp HTTP/1.1 Host: www.yahoo.com Connection:keep-alive … Application Layer (Name Resolution) ▪ Where is www.yahoo.com? What’s the address for www.yahoo.com My computer Oh, you can find it at 64.58.76.177 132.239.9.64 Local DNS server 132.239.51.18 Transport Layer (TCP) ▪ Break message into packets (TCP segments) ▪ Should be delivered reliably & in-order GET http://www.yahoo.com/r/mp HTTP/1.1 Host: www.yahoo.com Connection:keep-alive … 3 yahoo.c 2 p://www. -
Competing in Book Retailing
COMPETINGCOMPETING ININ CENTER FOR RESEARCH BOOK RETAILING: ON INFORMATION TECHNOLOGY AND THE CASE OF AMAZON.COM ORGANIZATIONS University of California, Irvine AUTHORS: 3200 Berkeley Place Aarti Shrikhande and Irvine, California 92697-4650 Vijay Gurbaxani and Graduate School of Management NOVEMBER 1999 Acknowledgement: This research has been supported by grants from the CISE/IIS/CSS Division of the U.S. National Science Foundation and the NSF Industry/University Cooperative Research Center (CISE/EEC) to the Center for Research on Information Technology and Organizations (CRITO) at the University of California, Irvine. Industry sponsors include: ATL Products, the Boeing Company, Bristol-Myers Squibb, Canon Information Systems, IBM, Nortel Networks, Rockwell International, Microsoft, Seagate Technology, Sun Microsystems, and Systems Management Specialists (SMS). The authors would like to thank Asish Ramchandran for his assistance on this project. TABLE OF CONTENTS INTRODUCTION....................................................................................................................................................................1 INDUSTRY ENVIRONMENT AND COMPETITION .......................................................................................................2 FIRM LEVEL ANALYSIS ......................................................................................................................................................9 BUSINESS MODEL .........................................................................................................................................................9 -
Internet Pricing and the History of Communications
Internet pricing and the history of communications Andrew Odlyzko AT&T Labs - Research [email protected] http://www.research.att.com/ amo Revised version, February 8, 2001. Abstract There are repeating patterns in the histories of communication technologies, including ordinary mail, the telegraph, the telephone, and the Internet. In particular, the typical story for each service is that quality rises, prices decrease, and usage increases to produce increased total revenues. At the same time, prices become simpler. The historical analogies of this paper suggest that the Internet will evolve in a similar way, towards simplicity. The schemes that aim to provide differentiated service levels and sophisticated pricing schemes are unlikely to be widely adopted. Price and quality differentiation are valuable tools that can provide higher revenues and increase utilization efficiency of a network, and thus in general increase social welfare. Such measures, most noticeable in airline pricing, are spreading to many services and products, especially high-tech ones. However, it appears that as communication services become less expensive and are used more fre- quently, those arguments lose out to customers’ desire for simplicity. In practice, user preferences express themselves through willingness to pay more for simple pricing plans. In addition, there is a strong “threshhold” effect to usage-sensitive billing. Even tiny charges based on utilization decrease usage substantially. In a rapidly growing market, it is in the service providers’ interest to encourage usage, and that argues for simple, preferably flat rate, pricing. Histori- cal evidence suggests that when service costs decrease, such arguments prevail over the need to operate a network at high utilization levels and to extract the highest possible revenues. -
A Zahlensysteme
A Zahlensysteme Außer dem Dezimalsystem sind das Dual-,dasOktal- und das Hexadezimalsystem gebräuchlich. Ferner spielt das Binär codierte Dezimalsystem (BCD) bei manchen Anwendungen eine Rolle. Bei diesem sind die einzelnen Dezimalstellen für sich dual dargestellt. Die folgende Tabelle enthält die Werte von 0 bis dezimal 255. Be- quemlichkeitshalber sind auch die zugeordneten ASCII-Zeichen aufgeführt. dezimal dual oktal hex BCD ASCII 0 0 0 0 0 nul 11111soh 2102210stx 3113311etx 4 100 4 4 100 eot 5 101 5 5 101 enq 6 110 6 6 110 ack 7 111 7 7 111 bel 8 1000 10 8 1000 bs 9 1001 11 9 1001 ht 10 1010 12 a 1.0 lf 11 101 13 b 1.1 vt 12 1100 14 c 1.10 ff 13 1101 15 d 1.11 cr 14 1110 16 e 1.100 so 15 1111 17 f 1.101 si 16 10000 20 10 1.110 dle 17 10001 21 11 1.111 dc1 18 10010 22 12 1.1000 dc2 19 10011 23 13 1.1001 dc3 20 10100 24 14 10.0 dc4 21 10101 25 15 10.1 nak 22 10110 26 16 10.10 syn 430 A Zahlensysteme 23 10111 27 17 10.11 etb 24 11000 30 18 10.100 can 25 11001 31 19 10.101 em 26 11010 32 1a 10.110 sub 27 11011 33 1b 10.111 esc 28 11100 34 1c 10.1000 fs 29 11101 35 1d 10.1001 gs 30 11110 36 1e 11.0 rs 31 11111 37 1f 11.1 us 32 100000 40 20 11.10 space 33 100001 41 21 11.11 ! 34 100010 42 22 11.100 ” 35 100011 43 23 11.101 # 36 100100 44 24 11.110 $ 37 100101 45 25 11.111 % 38 100110 46 26 11.1000 & 39 100111 47 27 11.1001 ’ 40 101000 50 28 100.0 ( 41 101001 51 29 100.1 ) 42 101010 52 2a 100.10 * 43 101011 53 2b 100.11 + 44 101100 54 2c 100.100 , 45 101101 55 2d 100.101 - 46 101110 56 2e 100.110 . -
Research Articles in the American Economic Review, the RAND Journal Ofeconomics, The
3 I. Introduction And Qualifications 1. My name is Nicholas S. Economides. I am a Professor ofEconomics at the Stern School ofBusiness ofNew York University, located at 44 West 4th Street New York, NY 10012. 2. I received a B.Sc. degree in Mathematical Economics (first class honors) from the London School ofEconomics in 1976, a Masters degree in Economics from the University of California at Berkeley in 1979 and a Ph.D. degree in Economics from Berkeley in 1981, specializing in Industrial Organization. 3. From 1981 to 1988, I was assistant and then associate professor ofeconomics at Columbia University. From 1988 to 1990, I was associate professor ofeconomics at Stanford University. I have taught at the Stern School ofBusiness since 1990. During the academic year 1996-1997, I was visiting professor at Stanford University. 4. I have published more than seventy research papers in the areas ofindustrial organization, microeconomics, network economics, antitrust, finance, and telecommunications policy, and I have given numerous seminar presentations at academic and government institutions and conferences. I have published academic research articles in the American Economic Review, the RAND Journal ofEconomics, the International Journal ofIndustrial Organization, the International Economic Review, the Journal ofEconomic Theory, and the Journal ofIndustrial Economics, among others. I am currently editor ofthe International Journal ofIndustrial Organization and ofNetnomics. I have served as advisor and consultant to major telecommunications companies, a number of 4 the Federal Reserve Banks, the Bank ofGreece, and major Financial Exchanges. I teach graduate (MBA and Ph.D.) courses in antitrust, industrial organization, microeconomics, and telecommunications. A copy ofmy curriculum vitae is attached as Attachment 1. -
INSIDE MICROSOFT (Part 2) 2/7/04 2:30 PM
07/15/96 INSIDE MICROSOFT (Part 2) 2/7/04 2:30 PM INSIDE MICROSOFT (Part 2) The untold story of how the Internet forced Bill Gates to reverse course (Continued from Part 1) BABY STEPS. In one breakout group, Allard tangled with Russell Siegelman, who was heading Marvel, the code name for what's now the Microsoft Network online service. Allard argued that instead of being proprietary, Marvel should be based on Web standards. Siegelman held his ground--and won. It was a decision that would later cost millions to reverse. Still, Net progress was made: TCP/IP would be integrated into Win95 and Windows NT, the version of Windows that runs network-server computers. The sales team was told to use the Web to dispense marketing information. The applications group agreed to give Word, the word-processing program, the ability to create Web pages. Next, Gates jumped deeper into the process by devoting much of his April Think Week--a semiannual retreat--to the Internet. His Apr. 16 memo, ``Internet Strategy and Technical Goals,'' contained the first signs of a growing corporate commitment. ``We want to and will invest resources to be a leader in Internet support,'' wrote Gates. It was a first step, albeit a measured one. ``I don't think he knew how much to bet yet,'' says Allard. But board member David F. Marquardt did: He recalls that he was ``amazed'' that Microsoft was putting so little into the Net. ``They weren't in Silicon Valley. When you're here, you feel it all around you,'' says Marquardt, a general partner at Technology Venture Investors in Menlo Park, Calif. -
The Internet Is a Semicommons
GRIMMELMANN_10_04_29_APPROVED_PAGINATED 4/29/2010 11:26 PM THE INTERNET IS A SEMICOMMONS James Grimmelmann* I. INTRODUCTION As my contribution to this Symposium on David Post’s In Search of Jefferson’s Moose1 and Jonathan Zittrain’s The Future of the Internet,2 I’d like to take up a question with which both books are obsessed: what makes the Internet work? Post’s answer is that the Internet is uniquely Jeffersonian; it embodies a civic ideal of bottom-up democracy3 and an intellectual ideal of generous curiosity.4 Zittrain’s answer is that the Internet is uniquely generative; it enables its users to experiment with new uses and then share their innovations with each other.5 Both books tell a story about how the combination of individual freedom and a cooperative ethos have driven the Internet’s astonishing growth. In that spirit, I’d like to suggest a third reason that the Internet works: it gets the property boundaries right. Specifically, I see the Internet as a particularly striking example of what property theorist Henry Smith has named a semicommons.6 It mixes private property in individual computers and network links with a commons in the communications that flow * Associate Professor, New York Law School. My thanks for their comments to Jack Balkin, Shyam Balganesh, Aislinn Black, Anne Chen, Matt Haughey, Amy Kapczynski, David Krinsky, Jonathon Penney, Chris Riley, Henry Smith, Jessamyn West, and Steven Wu. I presented earlier versions of this essay at the Commons Theory Workshop for Young Scholars (Max Planck Institute for the Study of Collective Goods), the 2007 IP Scholars conference, the 2007 Telecommunications Policy Research Conference, and the December 2009 Symposium at Fordham Law School on David Post’s and Jonathan Zittrain’s books. -
Worldcom1 Ethics Case Study
fWorldCom1 By Dennis Moberg (Santa Clara University) and Edward Romar (University of Massachusetts- Boston) An update for this case is available. 2002 saw an unprecedented number of corporate scandals: Enron, Tyco, Global Crossing. In many ways, WorldCom is just another case of failed corporate governance, accounting abuses, and outright greed. But none of these other companies had senior executives as colorful and likable as Bernie Ebbers. A Canadian by birth, the 6 foot, 3 inch former basketball coach and Sunday School teacher emerged from the collapse of WorldCom not only broke but with a personal net worth as a negative nine-digit number.2 No palace in a gated community, no stable of racehorses or multi-million dollar yacht to show for the telecommunications giant he created. Only debts and red ink--results some consider inevitable given his unflagging enthusiasm and entrepreneurial flair. There is no question that he did some pretty bad stuff, but he really wasn't like the corporate villains of his day: Andy Fastow of Enron, Dennis Koslowski of Tyco, or Gary Winnick of Global Crossing.3 Personally, Bernie is a hard guy not to like. In 1998 when Bernie was in the midst of acquiring the telecommunications firm MCI, Reverend Jesse Jackson, speaking at an all-black college near WorldCom's Mississippi headquarters, asked how Ebbers could afford $35 billion for MCI but hadn't donated funds to local black students. Businessman LeRoy Walker Jr., was in the audience at Jackson's speech, and afterwards set him straight. Ebbers had given over $1 million plus loads of information technology to that black college. -
Internet... the Final Frontier. an Ethnographic Account. Exploring the Cultural Space of the Net from the Inside. Mit CD-Rom
Schriftenreihe der Abteilung "Organisation und Technikgenese" des Forschungsschwerpunktes Technik-Arbeit-Umwelt am Wissenschaftszentrum Berlin für Sozialforschung FS II 2000- Internet… The Final Frontier: An Ethnographic Account Exploring the cultural space of the Net from the inside Sabine Helmers, Ute Hoffmann & Jeanette Hofmann Projektgruppe Kulturraum Internet http://duplox.wz-berlin.de Institute for Social Sciences Technical University Berlin and Social Science Research Center Berlin (WZB) Reichpietschufer 50, D-10785 Berlin Telefon (030) 25491-0, Fax (030) 25491-684 Abstract The research project "The Internet as a space for interaction", which completed its mission in Autumn 1998, studied the constitutive features of network culture and network organisation. Special emphasis was given to the dynamic interplay of technical and social conventions regarding both the Net's organisation as well as its change. The ethnographic perspective chosen studied the Internet from the inside. Research concentrated upon three fields of study: the hegemonial operating technology of net nodes (UNIX) the network's basic transmission technology (the Internet Protocol IP) and a popular communication service (Usenet). The project's final report includes the results of the three branches explored. Drawing upon the development in the three fields it is shown that changes that come about on the Net are neither anarchic nor arbitrary. Instead, the decentrally organised Internet is based upon technically and organisationally distributed forms of coordination -
The People Who Invented the Internet Source: Wikipedia's History of the Internet
The People Who Invented the Internet Source: Wikipedia's History of the Internet PDF generated using the open source mwlib toolkit. See http://code.pediapress.com/ for more information. PDF generated at: Sat, 22 Sep 2012 02:49:54 UTC Contents Articles History of the Internet 1 Barry Appelman 26 Paul Baran 28 Vint Cerf 33 Danny Cohen (engineer) 41 David D. Clark 44 Steve Crocker 45 Donald Davies 47 Douglas Engelbart 49 Charles M. Herzfeld 56 Internet Engineering Task Force 58 Bob Kahn 61 Peter T. Kirstein 65 Leonard Kleinrock 66 John Klensin 70 J. C. R. Licklider 71 Jon Postel 77 Louis Pouzin 80 Lawrence Roberts (scientist) 81 John Romkey 84 Ivan Sutherland 85 Robert Taylor (computer scientist) 89 Ray Tomlinson 92 Oleg Vishnepolsky 94 Phil Zimmermann 96 References Article Sources and Contributors 99 Image Sources, Licenses and Contributors 102 Article Licenses License 103 History of the Internet 1 History of the Internet The history of the Internet began with the development of electronic computers in the 1950s. This began with point-to-point communication between mainframe computers and terminals, expanded to point-to-point connections between computers and then early research into packet switching. Packet switched networks such as ARPANET, Mark I at NPL in the UK, CYCLADES, Merit Network, Tymnet, and Telenet, were developed in the late 1960s and early 1970s using a variety of protocols. The ARPANET in particular led to the development of protocols for internetworking, where multiple separate networks could be joined together into a network of networks. In 1982 the Internet Protocol Suite (TCP/IP) was standardized and the concept of a world-wide network of fully interconnected TCP/IP networks called the Internet was introduced. -
SEC News Digest, 10-20-1999
SEC NEWS DIGEST Issue 99-202 October 20, 1999 RULES AND RELATED MATTERS ADOPTION OF UPDATED EDGAR FILER MANUAL A revised EDGAR Filer Manual and Form ID became effective on October 18. This new version of EDGAR and the EDGAR Filer Manual (Release 6.60) incorporates changes resulting from the decision by CompuServe, a sub-contractor to TRW (the developer of the EDGAR system), to discontinue its EDGAR services. These services include the Public Data Network (PDN) for transmission of filings to EDGAR, private mailboxes for receiving EDGAR Acceptance/Suspense notifications and Return Copies, the EDGAR company database, and the bulletin board. TRW has contracted with UUNET to provide EDGAR Private Mail and PDN Services. Although The EDGAR bulletin board and the EDGAR company database will no longer be available, filers may obtain similar information from our Web Site at www.sec.gov and the TRW/UUNET Web Site at www.trw-edgar.com. The Form ID, the Uniform Application for Access Codes to File on EDGAR, was also changed to reflect the change in the EDGAR private mail service. The basic TRW/UUNET service will include five hours of access and a mailbox for messages. There will be additional charges for larger mailboxes and connect time over the basic limit. Those filers who want to use the public data network for transmission to EDGAR, who want a private system (instead of the Internet) for receipt of acceptance/suspense messages, or who want an electronic returned copy of their filings must sign up for this service. To access their new mailboxes, filers will use a standard POP3 mail client. -
United States Court of Appeals for the Second Circuit
05-0570-cv UNITED STATES COURT OF APPEALS FOR THE SECOND CIRCUIT ALBERTO GONZALES, in his official capacity as Attorney General of the United States, ROBERT S. MUELLER III, in his official capacity as Director of the Federal Bureau of Investigation, and MARION E. BOWMAN, in his official capacity as Senior Counsel to the Federal Bureau of Investigation, Defendants/Appellants, v. JOHN DOE, AMERICAN CIVIL LIBERTIES UNION, and AMERICAN CIVIL LIBERTIES UNION FOUNDATION, Plaintiffs/Appellees ON APPEAL FROM THE UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT OF NEW YORK BRIEF OF ELECTRONIC FRONTIER FOUNDATION, ET AL., IN SUPPORT OF APPELLEES AND AFFIRMATION OF JUDGMENT BELOW Lee Tien Kurt B. Opsahl Kevin S. Bankston Electronic Frontier Foundation 454 Shotwell Street San Francisco, CA 94110 (415) 436-9333 (415) 436-9993 (fax) CORPORATE DISCLOSURE STATEMENT Pursuant to Rule 26.1 of the Federal Rules of Appellate Procedure, Amici Curiae certify that no publicly held corporation or other publicly held entity owns 10% or more of any Amicus Curiae. Respectfully submitted, ____________________________ Lee Tien Kurt B. Opsahl Kevin S. Bankston Electronic Frontier Foundation 454 Shotwell Street San Francisco, CA 94110 (415) 436-9333 (415) 436-9993 (fax) TABLE OF CONTENTS I. INTERESTS OF AMICI.....................................................................................1 II. PRELIMINARY STATEMENT.........................................................................4 III. ARGUMENT ......................................................................................................5