Agent and Object Technology Lab Dipartimento di Ingegneria dell Informazione Università degli Studi di Parma. Computer Network.
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1 Agent and Object Technology Lab Dipartimento di Ingegneria dell Informazione Università degli Studi di Parma Computer Network Introduction Prof. Agostino Poggi
2 Summary Theory Data Transmission Packet Transmission Internetworking Networks for Embedded Systems Network Programming in Java Practice Network Programming in Java Software Project 2
3 Bibliography B. A. Forouzan. Data Communications and Networking, Fourth Edition, Mc Graw Hill, 2007 B. A. Forouzan. Reti di calcolatori e Internet. Mc Graw Hill,
4 My Home Page: Web Resources JAVA: IEEE: Embedded System: 4
5 Exam Three parts: A theory test after the teaching period Optional Lab attendance A software project The project can be combined with: Software engineering practical part Lab internship Final thesis 5
6 Programming Project Rules Can be performed alone or with a colleague Can be got from April 2009 to February 2010 Two kinds of project Software evaluation Computer Network [ + Software Engineering ] Software development Computer Network + [ Software Engineering Lab Internship Thesis ] 6
7 Software Evaluation The experimentation of the software The development of a very simple application The writing of a report composed of: Software description Main features Requirements How to install and use Application manual Application description Requirements How to install and use 7
8 Software Development The development of a software library, tool or application The code of the software must be commented by using the standard notations and tools (e.g., Javadoc for Java code) The writing of a report composed of: Software description Main features Requirements Design documentation How to install and use 8
9 How Can You Reach Me? Office: Palazzina 1 Sede Scientifica Ingegneria Parco Area delle Scienze 181A Phone number: Fax number: agostino.poggi@unipr.it 9
10 How Can You Reach Michele Tomaiuolo? Office: Palazzina 1 Sede Scientifica Ingegneria Parco Area delle Scienze 181A Phone number: Fax number: michele.tomaiuolo@unipr.it 10
11 What s the Difference? Mainframe PC & WS & Network 11
12 Motivations for Networking Information access Remote files (FTP, P2P) Remote Web pages (Web browser) Resource sharing Printers Hard disks CPU (remote login) Remote interaction Off-line On-line Among cooperative application programs Among humans Among both programs and humans 12
13 What a Network Includes Transmission hardware Special purpose hardware devices Interconnects transmission hardware Control transmission Run protocol software Protocol software Encodes and formats data Detects and corrects errors 13
14 What a Network Does Provides communication from one application to another that is Reliable Fair Efficient Automatically detects and corrects Data corruption Data loss Duplication Out-of-order delivery Automatically finds optimal path from source to destination 14
15 Simplified Communication Model 15
16 Simplified Data Communication Model 16
17 Simplified Network Model 17
18 Standards Required to allow for interoperability between equipment Advantages Ensures a large market for equipment and software Allows products from different vendors to communicate Disadvantages Freeze technology May be multiple standards for the same thing 18
19 Standards Preamble Dest addr Src addr Body CRC IP Header Data 19
20 Standardization Organizations International Telecommunication Union (ITU) which develops worldwide standards for telecommunication technologies Consultative Committee for International Telegraph and Telephone (CCITT) is responsible for development of Communication standards Institute of Electrical and Electronic Engineers (IEEE) International Standardization Organization (ISO) is responsible for a wide range of standards including networking standards 20
21 Standardization Organizations American National Standards Institute (ANSI) approves U.S. standards and develops U.S. positions in international standards organizations Internet Architecture Board (IA) groups internetwork researchers who discuss issues pertinent to Internet architecture Internet Engineering Task Force (IETF) consists of over 80 working groups responsible for developing Internet standards 21
Organizations have developed standard sets of protocols
Network Models Organizations have developed standard sets of protocols Some of these organizations are: The International Standards Organization (ISO) The Institute of Electrical and Electronic Engineers
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