数据与计算机通信Data and Computer Communications, Seventh Edition (英文原版进口)

.chapter 3 data transmission 55
3.1 concepts and terminology 57
3.2 analog and digital data transmission 68
3.3 transmission impairments 76
3.4 channel capacity 81
3.5 recommended reading 87
3.6 key terms, review questions, and problems 87
appendix 3a decibels and signal strength 90
chapter 4 guided and wireless transmission 93
4.1 guided transmission media 95
4.2 wireless transmission 107
4.3 wireless propagation 115
4.4 line-of-sight transmission 119
4.5 recommended reading and web sites 124
4.6 key terms, review questions, and problems 125
chapter 5 signal encoding techniques 129
5.1 digital data, digital signals 131
5.2 digital data, analog signals 142
5.3 analog data, digital signals 152
5.4 analog data, analog signals 159
5.5 recommended reading 165
5.6 key terms, review questions, and problems 166
chapter 6 digital data communication techniques 171
6.1 asynchronous and synchronous transmission 173
6.2 types of errors 176
6.3 error detection 177
6.4 error correction 185
6.5 line configurations 191
6.6 interfacing 193
6.7 recommended reading 203
6.8 key terms, review questions, and problems 204
chapter 7 data link control 207
7.1 flow control 209
7.2 error control 215
7.3 high-level data link control (hdlc) 221
7.4 recommended reading 228
7.5 key terms, review questions, and problems 229
appendix 7a performance issues 232
chapter 8 multiplexing 241
8.1 frequency division multiplexing 243
8.2 synchronous time division multiplexing 250
8.3 statistical time division multiplexing 260
8.4 asymmetric digital subscriber line 267
8.5 xdsl 270
8.6 recommended reading and web sites 272
8.7 key terms, review questions, and problems 272
chapter 9 spread spectrum 275
9.1 the concept of spread spectrum 276
9.2 frequency-hopping spread spectrum 277
9.3 direct sequence spread spectrum 282
9.4 code-division multiple access 287
9.5 recommended reading 291
9.6 key terms, review questions, and problems 291
part three wide area networks 295
chapter 10 circuit switching and packet switching 297
10.1 switching networks 299
10.2 circuit-switching networks 300
10.3 circuit-switching concepts 304
10.4 control signaling 307
10.5 softswitch architecture 316
10.6 packet-switching principles 318
10.7 x.25 326
10.8 frame relay 328
10.9 recommended reading and web sites 333
10.10 key terms, review questions, and problems 334
chapter 11 asynchronous transfer mode 337
11.1 protocol architecture 338
11.2 atm logical connections 339
11.3 atm cells 344
11.4 transmission of atm cells 350
11.5 atm service categories 353
11.6 atm adaptation layer 357
11.7 recommended reading and web sites 364
11.8 key terms, review questions, anql problems 364
chapter 12 routing in switched networks 367
12.1 routing in circuit-switching networks 368
12.2 routing in packet-switching networks 370
12.3 least-cost algorithms 385
12.4 recommended reading 390
12.5 key terms, review questions, and problems 390
chapter 13 congestion control in switched data networks 395
13.1 effects of congestion 397
13.2 congestion control 401
13.3 traffic management 404
13.4 congestion control in packet-switching networks 406
13.5 frame relay congestion control 406
13.6 atm traffic management 412
13.7 atm-gfr traffic management 425
13.8 recommended reading 427
13.9 key terms, review questions, and problems 428
chapter 14 cellular wireless networks 431
14.1 principles of cellular networks 432
14.2 first-generation analog 445
14.3 second-generation cdma 447
14.4 third-generation systems 455
14.5 recommended reading and web sites 459
14.6 key terms, review questions, and problems 460
part four local area networks 463
chapter 15 local area network overview 465
15.1 background 466
15.2 topologies and transmission media 470
15.3 lan protocol architecture 475
15.4 bridges 483
15.5 layer 2 and layer 3 switches 490
15.6 recommended reading and web site 496
15.7 key terms, review questions, and problems 496
chapter 16 high-speed lans 499
16.1 the emergence of high-speed lans 500
16.2 ethernet 502
16.3 token ring 516
16.4 fibre channel 520
16.5 recommended reading and web sites 525
16.6 key terms, review questions, and problems 526
appendix 16a digital signal encoding for lans 528
appendix 16b performance issues 535
chapter 17 wireless lans 543
17.1 overview 544
17.2 wireless lan technology 549
17.3 ieee 802.11 architecture and services 553
17.4 ieee 802.11 medium access control 558
17.5 ieee 802.11 physical layer 565
17.6 recommended reading and web sites 567
17.7 key terms and review questions 568
part five communications architecture and protocols 569
chapter 18 internetwork protocols 571
18.1 basic protocol functions 572
18.2 principles of internetworking 580
18.3 connectionlcss intcrnetworking 584
18.4 intemet protocol 592
18.5 ipv6 600
18.6 recommended reading and web sites 610
18.7 key terms, review questions, and problems 611
chapter 19 internetwork operation 615
19.1 multicasting 617
19.2 routing protocols 626
19.3 integrated services architecture 637
19.4 differentiated services 648
19.5 recommended reading and web sites 657
19.6 key terms, review questions, and problems 659
chapter 20 transport protocols 663
20.1 connection-oriented transport protocol mechanisms 664
20.2 tcp 683
20.3 tcp congestion control 691
20.4 udp 700
20.5 recommended reading 702
20.6 key terms, review questions, and problems 702
chapter 21 network security 705
21.1 security requirements and attacks 707
21.2 confidentiality with symmetric enfryption 708
21.3 message authentication and hash functions 717
21.4 public-key encryption and digital signatures 724
21.5 secure socket layer and transport layer security 731
21.6 ipv4 and ipv6 security 736
21.7 recommended reading and web sites 741
21.8 key terms, review questions, and problems 741
chapter 22 distributed applications 745
22.1 electronic mail--smtp and mime 746
22.2 hypertext transfer protocol (http) 762
22.3 network management--snmp 775
22.4 recommended reading and web sites 785
22.5 key terms, review questions, and problems 786
appendixa rfcs cited inthis book 789
appendix b fourier analysis
b. 1 fourier series representation of periodic signals 791
b.2 fourier transform representation of aperiodic signals 792
b.3 recommended reading 796
appendix c sockets programming 797
appendix d projects for teaching data and computer
communications 799
d. 1 simulation projects 799
d.2 performance modeling 800
d.3 research projects 801
d.4 reading/report assignments 801
glossary 803
references 815
index 823

.　　For many instructors, an important component of a data communications or networking course is a project or set of projects by which the student gets hands-on experience to reinforce concepts from the text. This book provides an unparalleled degree of support for including a projects component in the course. The instructor's manual not only includes guidance on how to assign and structure the projects, but also includes a set of suggested projects that covers a broad range of topics from the text, including research projects, simulation projects, analytic modeling projects, and reading/report assignments. See Appendix D for details.
　　SOCKETS PROGRAMMING
　　The book includes a brief description of Sockets (Appendix C), with a more detailed description available at the book's Web site. The Instructors manual includes a set of programming projects. Sockets programming is an "easy" topic and one that can result in very satisfying hands-on projects for students.
　　WHAT'S NEW IN THE SEVENTH EDITION
　　This seventh edition is seeing the light of day less than 4 years after the publication of the sixth edition. During that time, the pace of change in this field continues unabated. In this new edition, I try to capture these changes while maintaining a broad and comprehensive coverage of the entire field. To begin the process of revision, the sixth edition of this book was extensively reviewed by a number of professors who teach the subject. The result is that, in many places, the narrative has been clarified and tightened, and illustrations have been improved. Also, a number of new "field-tested" problems have been added.
　　 Beyond these refinements to improve pedagogy and user-friendliness, there have been major substantive changes throughout the book. Every chapter has been revised, new chapters have been added, and the overall organization of the book has changed. Highlights include:
　　 · Wireless communications and networking: There is a significant increase in the amount of material on wireless communications, wireless networks, and wireless standards. The book now devotes one chapter each to spread spectrum technology, cellular wireless networks, and wireless LANs.
　　 · Gigabit Ethernet: The discussion on Gigabit Ethernet has been updated and an introduction to 10-Gbps Ethernet has been added.
　　 · Differentiated services: There have been substantial developments since the publication of the sixth edition in enhancements to the Internet to support a variety of multimedia and time-sensitive traffic. The most important development, and perhaps the most important vehicle for providing QoS in IP-based networks, is Differentiated Services (DS). This edition provides thorough coverage of DS.
　　 · Guaranteed frame rate (GFR): Since the sixth edition, a new ATM service has been standardized: GFR. GFR is designed specifically to support IP backbone subnetworks. This edition provides an explanation of GFR and examines the mechanisms underlying the GFR service.
　　 · Multiprotocol label switching (MPLS): MPLS has emerged as a fundamentally important technology in the Internet and is covered in this edition.
　　 · TCP/IP details: A new background chapter on TCP and IP has been added, pulling together material scattered throughout the sixth edition. This material is vital to an understanding of QoS and performance issues in IP-based networks.
　　 In addition, throughout the book, virtually every topic has been updated to reflect the developments in standards and technology that have occurred since the publication of the fifth edition.
　　 acknowledgments
　　 This new edition has benefited from review by a number of people, who gave generously of their time and expertise. The following people reviewed all or a large part of the manuscript: Michael J. Donahoo (Baylor University), Gary Harkin (Montana State University), Larry Owens (California State U. Fresno), S. Hossein Hosseini (U. of Wisconsin-Milwaukee), and Dr. Charles Baker (Southern Methodist University).
　　 Thanks also to the many people who provided detailed technical reviews of a single chapter: Dave Tweed, Bruce Lane, Denis McMahon, Charles Freund, Paul Hoadley, Stephen Ma, Sandeep Subramaniam, Dragan Cvetkovic, Fernando Gont, Neil Giles, Rajesh Thundil, and Rick Jones.
　　 Finally, I would like to thank the many people responsible for the publication of the book, all of whom did their usual excellent job. This includes the staff at Prentice Hall, particularly my editor Alan Apt, his assistant Patrick Lindner, and production manager Rose Kernan. Also, Jake Warde of Warde Publishers managed the supplements and reviews; and Patricia M. Daly did the copyediting.