As one of the fastest growing technologies in our culture today, data communications and networking presents a unique challenge for instructors. As both the number and types of students are increasing, it is essential to have a textbook that provides coverage of the latest advances, while presenting the material in a way that is accessible to students with little or no background in the field. Using a bottom-up approach, 'Data Communications and Networking' presents this highly technical subject matter without relying on complex formulas by using a strong pedagogical approach supported by more than 700 figures. Now in its Fourth Edition, this textbook brings the beginning student right to the forefront of the latest advances in the field, while presenting fundamentals in a clear, straightforward manner. Students will find better coverage, improved figures and better explanations on cutting-edge material.

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Part 1 Overview of Data Communications and Networking
1 Introduction
2 Network Models

Part 2 Physical Layer
3 Signals
4 Digital Transmission
5 Analog Transmission
6 Multiplexing
7 Transmission Media
8 Circuit Switching and Telephone Network
9 High-Speed Digital Access: DSL, Cable Modems, and SONET

Part 3 Data Link Layer
10 Error Detection and Correction
11 Data Link Control and Protocols
12 Point-to-Point Access: PPP
13 Multiple Access
14 Local Area Networks: Ethernet
15 Wireless LANs
16 Connecting LANs, Backbone Networks, and Virtual LANs
17 Cellular Telephone and Satellite Networks
18 Virtual Circuit Switching: Frame Relay and ATM

Part 4 Network Layer
19 Host-to-Host Delivery: Internetworking, Addressing, and Routing
20 Network Layer Protocols: ARP, IPv4, ICMP, IPv6, and ICMPv6
21 Unicast and Multicast Routing: Routing Protocols

Part 5 Transport Layer
22 Process-to-Process Delivery: UDP and TCP
23 Congestion Control and Quality of Service

Part 6 Application Layer
24 Client-Server Model: Socket Interface
25 Domain Name System (DNS)
26 Electronic Mail (SMTP) and File Transfer (FTP)
27 HTTP and WWW
28 Multimedia

Part 7 Security
29 Cryptography
30 Message Security, User Authentication, and Key Management
31 Security Protocols in the Internet

Appendix A ASCII Code
Appendix B Numbering Systems and Transformation
Appendix C The OSI Model
Appendix D 8B/6T Code
Appendix E Checksum Calculation
Appendix F Structure of a Router
Appendix G ATM LANs
Appendix H Client-Server Programs
Appendix I RFCs
Appendix J UDP and TCP Ports
Appendix K Contact Addresses