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[null,"1.","Record Nr.",null,"UNINA9910153250003321"]
[null,null,"Autore",null,"Comer Douglas"]
[null,null,"Titolo",null,"Computer networks and Internets / / Douglas E. Comer"]
[null,null,"Pubbl/distr/stampa",null,"Boston : , : Pearson, , [2015]"]
[{"$nulls":4},"©2015"]
[null,null,"ISBN",null,"1-292-06182-0"]
[null,null,"Edizione",null,"[Sixth, global edition.]"]
[null,null,"Descrizione fisica",null,"1 online resource (668 pages) : illustrations"]
[null,null,"Disciplina",null,"004.6"]
[null,null,"Soggetti",null,"Internetworking (Telecommunication)"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,null,"Note generali","Includes index."]
[null,null,"Nota di contenuto",null,"Cover -- Dedication -- Contents -- Preface -- About the Author -- Enthusiastic Comments About Computer Networks and Internets -- More Comments About Computer Networks and Internets -- Other Books By Douglas Comer -- Part I: Introduction and Internet Applications -- Chapter 1: Introduction and Overview -- 1.1 Growth of Computer Networking -- 1.2 Why Networking Seems Complex -- 1.3 The Five Key Aspects of Networking -- 1.3.1 Network Applications and Network Programming -- 1.3.2 Data Communications -- 1.3.3 Packet Switching and Networking Technologies -- 1.3.4 Internetworking With TCP/IP -- 1.3.5 Additional Networking Concepts and Technologies -- 1.4 Public And Private Parts Of The Internet -- 1.4.1 Public Network -- 1.4.2 Private Network -- 1.5 Networks, Interoperability, and Standards -- 1.6 Protocol Suites and Layering Models -- 1.7 How Data Passes Through Layers -- 1.8 Headers and Layers -- 1.9 ISO and the OSI Seven Layer Reference Model -- 1.10 Remainder of the Text -- 1.11 Summary -- Exercises -- Chapter 2: Internet Trends -- 2.1 Introduction -- 2.2 Resource Sharing -- 2.3 Growth of the Internet -- 2.4 From Resource Sharing To Communication -- 2.5 From Text To Multimedia -- 2.6 Recent Trends -- 2.7 From Individual Computers To Cloud Computing -- 2.8 Summary -- Exercises -- Chapter 3: Internet Applications and Network Programming -- 3.1 Introduction -- 3.2 Two Basic Internet Communication Paradigms -- 3.2.1 Stream Transport in the Internet -- 3.2.2 Message Transport in The Internet -- 3.3 Connection-Oriented Communication -- 3.4 The Client-Server Model of Interaction -- 3.5 Characteristics of Clients and Servers -- 3.6 Server Programs and Server-Class Computers -- 3.7 Requests, Responses, "]
[{"$nulls":4},"and Direction of Data Flow -- 3.8 Multiple Clients and Multiple Servers -- 3.9 Server Identification and Demultiplexing -- 3.10 Concurrent Servers."]
[{"$nulls":4},"3.11 Circular Dependencies Among Servers -- 3.12 Peer-To-Peer Interactions -- 3.13 Network Programming and the Socket API -- 3.14 Sockets, Descriptors, and Network I/O -- 3.15 Parameters and the Socket API -- 3.16 Socket Calls in a Client and Server -- 3.17 Socket Functions Used By Both Client and Server -- 3.17.1 The Socket Function -- 3.17.2 The Send Function -- 3.17.3 The Recv Function -- 3.17.4 Read and Write With Sockets -- 3.17.5 The Close Function -- 3.18 The Connect Function Used Only By a Client -- 3.19 Socket Functions Used Only By a Server -- 3.19.1 The Bind Function -- 3.19.2 The Listen Function -- 3.19.3 The Accept Function -- 3.20 Socket Functions Used with the Message Paradigm -- 3.20.1 Sendto and Sendmsg Socket Functions -- 3.20.2 Recvfrom and Recvmsg Functions -- 3.21 Other Socket Functions -- 3.22 Sockets, Threads, and Inheritance -- 3.23 Summary -- Exercises -- Chapter 4: Traditional Internet Applications -- 4.1 Introduction -- 4.2 Application-Layer Protocols -- 4.3 Representation and Transfer -- 4.4 Web Protocols -- 4.5 Document Representation with HTML -- 4.6 Uniform Resource Locators and Hyperlinks -- 4.7 Web Document Transfer with HTTP -- 4.8 Caching in Browsers -- 4.9 Browser Architecture -- 4.10 File Transfer Protocol (FTP) -- 4.11 FTP Communication Paradigm -- 4.12 Electronic Mail -- 4.13 The Simple Mail Transfer Protocol (SMTP) -- 4.14 ISPs, Mail Servers, and Mail Access -- 4.15 Mail Access Protocols (POP, IMAP) -- 4.16 Email Representation Standards (RFC2822, MIME) -- 4.17 Domain Name System (DNS) -- 4.18 Domain Names that Begin with a Service Name -- 4.19 The DNS Hierarchy and Server Model -- 4.20 Name Resolution -- 4.21 Caching in DNS Servers -- 4.22 Types of DNS Entries -- 4.23 Aliases and CNAME Resource Records -- 4.24 Abbreviations and the DNS -- 4.25 Internationalized Domain Names."]
[{"$nulls":4},"4.26 Extensible Representations (XML) -- 4.27 Summary -- Exercises -- Part II: Data Communications Basics -- Chapter 5: Overview of Data Communications -- 5.1 Introduction -- 5.2 The Essence of Data Communications -- 5.3 Motivation and Scope of the Subject -- 5.4 The Conceptual Pieces of a Communications System -- 5.5 The Subtopics of Data Communications -- 5.6 Summary -- Exercises -- Chapter 6: Information Sources and Signals -- 6.1 Introduction -- 6.2 Information Sources -- 6.3 Analog and Digital Signals -- 6.4 Periodic and Aperiodic Signals -- 6.5 Sine Waves and Signal Characteristics -- 6.6 Composite Signals -- 6.7 The Importance of Composite Signals and Sine Functions -- 6.8 Time and Frequency Domain Representations -- 6.9 Bandwidth of An Analog Signal -- 6.10 Digital Signals and Signal Levels -- 6.11 Baud and Bits Per Second -- 6.12 Converting a Digital Signal To Analog -- 6.13 The Bandwidth of a Digital Signal -- 6.14 Synchronization and Agreement About Signals -- 6.15 Line Coding -- 6.16 Manchester Encoding Used in Computer Networks -- 6.17 Converting an Analog Signal to Digital -- 6.18 The Nyquist Theorem and Sampling Rate -- 6.19 Nyquist Theorem and Telephone System Transmission -- 6.20 Nonlinear Encoding -- 6.21 Encoding and Data Compression -- 6.22 Summary -- Exercises -- Chapter 7: Transmission Media -- 7.1 Introduction -- 7.2 Guided and Unguided Transmission -- 7.3 A Taxonomy By Forms of Energy -- 7.4 Background Radiation and Electrical Noise -- 7.5 Twisted Pair Copper Wiring -- 7.6 Shielding: Coaxial Cable and Shielded Twisted Pair -- 7.7 Categories of Twisted Pair Cable -- 7.8 Media Using Light Energy and Optical Fibers -- 7.9 Types of Fiber and Light Transmission -- 7.10 Optical Fiber Compared to Copper Wiring -- 7.11 Infrared Communication Technologies -- "]
[{"$nulls":4},"7.12 Point-To-Point Laser Communication."]
[{"$nulls":4},"7.13 Electromagnetic (Radio) Communication -- 7.14 Signal Propagation -- 7.15 Types of Satellites -- 7.16 Geostationary Earth Orbit (GEO) Satellites -- 7.17 GEO Coverage of the Earth -- 7.18 Low Earth Orbit (LEO) Satellites and Clusters -- 7.19 Tradeoffs Among Media Types -- 7.20 Measuring Transmission Media -- 7.21 The Effect of Noise on Communication -- 7.22 The Significance of Channel Capacity -- 7.23 Summary -- Exercises -- Chapter 8: Reliability and Channel Coding -- 8.1 Introduction -- 8.2 The Three Main Sources of Transmission Errors -- 8.3 Effect of Transmission Errors on Data -- 8.4 Two Strategies For Handling Channel Errors -- 8.5 Block and Convolutional Error Codes -- 8.6 An Example Block Error Code: Single Parity Checking -- 8.7 The Mathematics of Block Error Codes and (n,k) Notation -- 8.8 Hamming Distance: A Measure of a Code's Strength -- 8.9 The Hamming Distance Among Strings in a Codebook -- 8.10 The Tradeoff Between Error Detection and Overhead -- 8.11 Error Correction with Row and Column (RAC) Parity -- 8.12 The 16-Bit Checksum Used in the Internet -- 8.13 Cyclic Redundancy Codes (CRCs) -- 8.14 An Efficient Hardware Implementation Of CRC -- 8.15 Automatic Repeat Request (ARQ) Mechanisms -- 8.16 Summary -- Exercises -- Chapter 9: Transmission Modes -- 9.1 Introduction -- 9.2 A Taxonomy of Transmission Modes -- 9.3 Parallel Transmission -- 9.4 Serial Transmission -- 9.5 Transmission Order: Bits and Bytes -- 9.6 Timing of Serial Transmission -- 9.7 Asynchronous Transmission -- 9.8 RS-232 Asynchronous Character Transmission -- 9.9 Synchronous Transmission -- 9.10 Bytes, Blocks, and Frames -- 9.11 Isochronous Transmission -- 9.12 Simplex, Half-Duplex, and Full-Duplex Transmission -- 9.13 DCE and DTE Equipment -- 9.14 Summary -- Exercises -- Chapter 10: Modulation and Modems -- 10.1 Introduction."]
[{"$nulls":4},"10.2 Carriers, Frequency, and Propagation -- 10.3 Analog Modulation Schemes -- 10.4 Amplitude Modulation -- 10.5 Frequency Modulation -- 10.6 Phase Shift Modulation -- 10.7 Amplitude Modulation and Shannon's Theorem -- 10.8 Modulation, Digital Input, and Shift Keying -- 10.9 Phase Shift Keying -- 10.10 Phase Shift and a Constellation Diagram -- 10.11 Quadrature Amplitude Modulation -- 10.12 Modem Hardware for Modulation and Demodulation -- 10.13 Optical and Radio Frequency Modems -- 10.14 Dialup Modems -- 10.15 QAM Applied to Dialup -- 10.16 V.32 and V.32bis Dialup Modems -- 10.17 Summary -- Exercises -- Chapter 11: Multiplexing and Demultiplexing(Channelization) -- 11.1 Introduction -- 11.2 The Concept of Multiplexing -- 11.3 The Basic Types of Multiplexing -- 11.4 Frequency Division Multiplexing (FDM) -- 11.5 Using a Range of Frequencies Per Channel -- 11.6 Hierarchical FDM -- 11.7 Wavelength Division Multiplexing (WDM) -- 11.8 Time Division Multiplexing (TDM) -- 11.9 Synchronous TDM -- 11.10 Framing Used in the Telephone System Version of TDM -- 11.11 Hierarchical TDM -- 11.12 The Problem With Synchronous TDM: Unfilled Slots -- 11.13 Statistical TDM -- 11.14 Inverse Multiplexing -- 11.15 Code Division Multiplexing -- 11.16 Summary -- Exercises -- Chapter 12: Access and Interconnection Technologies -- 12.1 Introduction -- 12.2 Internet Access Technology: Upstream and Downstream -- 12.3 Narrowband and Broadband Access Technologies -- 12.3.1 Narrowband Technologies -- 12.3.2 Broadband Technologies -- 12.4 The Local Loop and ISDN -- 12.5 Digital Subscriber Line (DSL) Technologies -- 12.6 Local Loop Characteristics and Adaptation -- 12.7 The Data Rate Of ADSL -- 12.8 ADSL Installation and Splitters -- 12.9 Cable Modem Technologies -- 12.10 The Data Rate of Cable Modems -- 12.11 Cable "]
[{"$nulls":4},"Modem Installation -- 12.12 Hybrid Fiber Coax."]
[{"$nulls":4},"12.13 Access Technologies that Employ Optical Fiber."]
[null,null,null,"Sommario/riassunto","Appropriate for all introductory-to-intermediate courses in computer networking, the Internet, or Internet applications; students need no background in networking, operating systems, or advanced mathematics.      Leading networking authority Douglas Comer presents a wide-ranging, self-contained tour of the concepts, principles, and technologies that enable today's Internet to support applications ranging from web browsing to telephony and multimedia. Comer begins by illuminating the applications and facilities offered by today's Internet. Next, he systematically introduces the underlying network technologies and protocols that make them possible. With these concepts and technologies established, he introduces several of the most important contemporary issues faced by network implementers and managers, including quality of service, Internet telephony, multimedia, network security, and network management. Comer has carefully designed this book to support both top-down and bottom-up teaching approaches. Students need no background in operating systems, and no sophisticated math: Comer relies throughout on figures, drawings, examples, and analogies, not mathematical proofs.        Teaching and Learning Experience  This program will provide a better teaching and learning experience-for you and your students.    Broad Coverage of Key Concepts and Principles, Presented in a Technology-independent Fashion: Comer focuses on imparting knowledge that students will need regardless of which technologies emerge or become obsolete.  Flexible Organization that Supports both Top-down and Bottom-up Teaching Approaches: Chapters may be sequenced to accommodate a wide variety of course needs and preferences.  An Accessible Presentation that Resonates with Students: Comer relies throughout on figures, drawings, examples, and analogies, not"]
[{"$nulls":4},"mathematical proofs.  Keep Your Course Current: Content is refreshed to provide the most up-to-date information on new technologies for your course."]