Connection-Oriented vs. Connectionless Communication

There are two primary approaches to communicating between applicationsconnection oriented and connectionless. Connection-oriented communications are similar to the telephone system, in which a connection is established and held for the length of the session. Connectionless services are similar to the postal service, in which two letters mailed from the same place and to the same destination may actually take two dramatically different paths through the system and even arrive at different times, or not at all.

In a connection-oriented approach, computers send each other control informationthrough a technique called handshakingto initiate an end-to-end connection. The Internet is an unreliable network, which means that data sent across the Internet may be damaged or lost. Data is sent in packets, which contain pieces of the data along with information that helps the Internet route the packets to the proper destination. The Internet does not guarantee anything about the packets sent; they could arrive corrupted or out of order, as duplicates or not at all. The Internet makes only a "best effort" to deliver packets. A connection-oriented approach ensures reliable communications on unreliable networks, guaranteeing that sent packets will arrive at the intended receiver undamaged and be reassembled in the correct sequence.

In a connectionless approach, the two computers do not handshake before transmission, and reliability is not guaranteeddata sent may never reach the intended recipient. A connectionless approach, however, avoids the overhead associated with handshaking and enforcing reliabilityless information often needs to be passed between the hosts.

Preface

Index

    Introduction to Computers, the Internet and Visual C#

    Introduction to the Visual C# 2005 Express Edition IDE

    Introduction to C# Applications

    Introduction to Classes and Objects

    Control Statements: Part 1

    Control Statements: Part 2

    Methods: A Deeper Look

    Arrays

    Classes and Objects: A Deeper Look

    Object-Oriented Programming: Inheritance

    Polymorphism, Interfaces & Operator Overloading

    Exception Handling

    Graphical User Interface Concepts: Part 1

    Graphical User Interface Concepts: Part 2

    Multithreading

    Strings, Characters and Regular Expressions

    Graphics and Multimedia

    Files and Streams

    Extensible Markup Language (XML)

    Database, SQL and ADO.NET

    ASP.NET 2.0, Web Forms and Web Controls

    Web Services

    Networking: Streams-Based Sockets and Datagrams

    Searching and Sorting

    Data Structures

    Generics

    Collections

    Appendix A. Operator Precedence Chart

    Appendix B. Number Systems

    Appendix C. Using the Visual Studio 2005 Debugger

    Appendix D. ASCII Character Set

    Appendix E. Unicode®

    Appendix F. Introduction to XHTML: Part 1

    Appendix G. Introduction to XHTML: Part 2

    Appendix H. HTML/XHTML Special Characters

    Appendix I. HTML/XHTML Colors

    Appendix J. ATM Case Study Code

    Appendix K. UML 2: Additional Diagram Types

    Appendix L. Simple Types

    Index



    Visual C# How to Program
    Visual C# 2005 How to Program (2nd Edition)
    ISBN: 0131525239
    EAN: 2147483647
    Year: 2004
    Pages: 600

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