CMPE 150 Introduction to Computer Networks Dr Chane L Fullmer chane cse ucsc edu Spring 2003 UCSC CMPE150 1 Class information Text Computer Networking 2nd Ed Kurose Ross Chapters 1 5 4 3 2 in that order We re going from the bottom up Spring 2003 UCSC CMPE150 2 Class information Homework Based on Lecture AND text reading One set for each chapter Midterm April 29 requires Scantron Final June 11 8 00 to 11 00 Bring Scantron Spring 2003 UCSC CMPE150 3 Optional Class Project Network programming project In lieu of taking final examination Goal Build an FTP client server from scratch Using C language Details on web page Soon Spring 2003 UCSC CMPE150 4 Grading Information Weights Homework Midterm Final Spring 2003 40 30 30 UCSC CMPE150 5 Grading Information Grade A 90 100 B 75 90 C 60 75 Fail Spring 2003 Score UCSC 60 CMPE150 6 Homework Assignments Homework assignment 1 Problems from text at end of chapter See web page for problem numbers Due by April 8 next Tuesday Spring 2003 UCSC CMPE150 7 CMPE 150 Introduction to Computer Networks LECTURE 1 Introduction and Background Spring 2003 UCSC CMPE150 8 Outline What is a computer network Brief history and outlook of the Internet What are communication protocols and how do we go about studying them Architectural structure of the Internet Issues of interest with transmission media as a black box Next lecture More about networks and links Spring 2003 UCSC CMPE150 9 What Is a Computer Network A communication network is a set of nodes connected by links and able to communicate with one another A computer network is a communication network in which nodes are computers The purpose of the network is to serve users which can be humans or processes Network links can be point to point or multipoint and implemented with several transmission media Information exchanged can be represented in multiple media audio text video images etc Services provided to users can vary widely Spring 2003 UCSC CMPE150 10 Why Learn about Computer Networks Before com went bust THE MONEY THE JOBS Microsoft Cisco HP Sun Nokia Lucent AT T Sprint MCI THE IPOS AND ACQUISITIONS Akamai Fastforward Inktomi Granite Cisco Rooftop Nokia Spring 2003 UCSC CMPE150 11 Why Learn about Computer Networks After com collapse NETWORKING RESEARCH IS GREAT Yeah sure THE ONLY CLASS MEETNG YOUR SCHEDULE Spring 2003 UCSC CMPE150 12 But Really Why Learn about Computer Networks Computer networks started as a means for Distributed processing Communicating among people electronic mail conferencing Increasing system reliability The web and affordable hardware have changed this We are evolving into Internet based enterprises Internet based home services and an Internet society The network will be everywhere Computers will be used in almost everything we build including sensors appliances books newspapers These computers need to be interconnected NETWORKING COMPUTING Spring 2003 UCSC CMPE150 13 Why Learn about Computer Networks Industry and research are wide open to innovation As we will discuss over the next few weeks today s protocols are oriented to support host to host communication and assume a clientserver model for services and an open door policy for the Internet community The continuing success of the Internet requires Person to person communication voice and other media over the Internet Client to content services Security in the services the infrastructure and the clients of the Internet Innovation required includes Mechanisms to look up content rather than addresses Protocols aimed at the new types of communication and services Protocols that adhere to new principles of design Spring 2003 UCSC CMPE150 14 Evolution of Computer Networks 1876 1890s 1897 1940s 1960 1960s 1961 1962 1965 1968 1969 1970s Telephone by A Graham Bell Electromagnetic telephone switches Cathode Ray Tube by K F Braun Computers error detection and retransmission RS 232 physical layer interface the serial port and modems T 1 carrier system for telephone transmission 1 5Mbps The Compatible Time Sharing System Paul Baran at RAND proposes packet switching Automatic equalization by Bob Lucky and others Carterfone FCC decision that led to AT T divestiture in 1984 DARPA funds project on packet switching Computerized switches work on ISDN starts Spring 2003 UCSC CMPE150 15 Evolution of Computer Networks 1970s ARPANET starts UCLA Utah SRI UCSB its technology evolved into today s Internet 1970s ALOHA system at U of Hawaii first protocol for multiple access channels leads to Ethernet 1970s GUI mouse hypertext by Doug Engelbart at SRI 1974 A Protocol for Packet Network Interconnection V Cerf and R Kahn IEEE Trans Comm May 1980s OSI open system interconnection reference model 1982 TCP IP is deployed in ARPANET MILNET 1984 Host table evolves into DNS in ARPANET 1984 AT T breaks up 1986 NSFNET is created becomes Internet backbone 1992 WWW by Tim Berners Lee CERN is released gives a GUI to the Internet 1990s Caches and proxies helping clients access content Spring 2003 UCSC CMPE150 16 Evolution of Computer Networks 1970s CCITT publishes standards for public data networks X 25 standards 1980s Token ring LANs FDDI emerge do not replace Ethernet 1990s ATM evolves does not replace IP 1990s Internet From 4 to 30M wired published nodes in two decades 1990s SONET synchronous optical network and SDH synchronous digital hierarchy evolve 1990s Cellular phones laptops palmtops become popular 1999 Gigabit Ethernet starts simplicity wins again Spring 2003 UCSC CMPE150 17 Evolution of Computer Networks What will happen in the 2000s Ad hoc wireless networks self configuring nets Networked sensors and appliances System area networks the network is in the computer Network based computing grid computing the computer processing and storage is in the network Internet to go deeply networked systems IP voice IP devices Content routing ISPs start to be CDNs allow clients to obtain content based on its name from the best location Networking Spring 2003 UCSC Computing CMPE150 18 What Do We Study We will take the Internet as our running example The Internet has computer hardware software operating systems transmission technology services defined over it What is its glue Communication protocols implemented in software or hardware transform otherwise isolated machines into a society of computers Protocols specify how processes in different machines can interact to provide a given service Distributed algorithms are the essence of what we study Spring 2003 UCSC CMPE150
View Full Document
Unlocking...