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DCN By Behrouz Forouzan pdf free download


DCN By Behrouz Forouzan pdf free download


DCN By Behrouz Forouzan pdf free download

DCN By Behrouz Forouzan pdf free download


Data communications and networking are changing the way we do business and the way we live. Business decisions have to be made ever more quickly, and the decision makers require immediate access to accurate information. Why wait a week for that report from Germany to arrive by mail when it could appear almost instantaneously through computer networks? Businesses today rely on computer networks and internetworks. But before we ask how quickly we can get hooked up, we need to know how networks operate, what types of technologies are available, and which design best fills which set of needs. The development of the personal computer brought about tremendous changes for business, industry, science, and education. A similar revolution is occurring in data communications and networking. Technological advances are making it possible for communications links to carry more and faster signals. As a result, services are evolving to allow use of this expanded capacity. For example, established telephone services such as conference calling, call waiting, voice mail, and caller ID have been extended.
Research in data communications and networking has resulted in new technologies. One goal is to be able to exchange data such as text, audio, and video from all points in the world. We want to access the Internet to download and upload information quickly and accurately and at any time. This chapter addresses four issues: data communications, networks, the Internet, and protocols and standards. First we give a broad definition of data communications. Then we define networks as a highway on which data can travel. The Internet is discussed as a good example of an internetwork (i.e., a network of networks). Finally, we discuss different types of protocols, the difference between protocols and standards, and the organizations that set those standards.
Part 1 provides a general idea of what we will see in the rest of the book. Four major concepts are discussed: data communications, networking, protocols and standards, and networking models. Networks exist so that data may be sent from one place to another-the basic concept of data communications. To fully grasp this subject, we must understand the data communication components, how different types of data can be represented, and how
to create a data flow. Data communications between remote parties can be achieved through a process called networking, involving the connection of computers, media, and networking devices. Networks are divided into two main categories: local area networks (LANs) and wide area networks (WANs). These two types of networks have different characteristics and different functionalities. The Internet, the main focus of the book, is a collection of LANs and WANs held together by internetworking devices. Protocols and standards are vital to the implementation of data communications and networking. Protocols refer to the rules; a standard is a protocol that has been
adopted by vendors and manufacturers. Network models serve to organize, unify, and control the hardware and software components of data communications and networking. Although the term “network model” suggests a relationship to networking, the model also encompasses data communications.

DCN By Behrouz Forouzan pdf free download contains these contents:


PART 1 Overview 1
Chapter 1 Introduction 3
Chapter 2 Network Models 27
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
Physical Layer and Media 55
Data and Signals 57
Digital Transmission 101
Analog Transmission 141
Bandwidth Utilization: Multiplexing and Spreading 161
Transmission Media 191
Switching 213
Using Telephone and Cable Networksfor Data Transmission 241
Data Link Layer 265
Error Detection and Correction 267
Data Link Control 307
Multiple Access 363
Wired LANs: Ethernet 395
Wireless LANs 421
Connecting LANs, Backbone Networks, and Virtual LANs 445
Wireless WANs: Cellular Telephone and Satellite Networks 467
Virtual-Circuit Nenvorks: Frame Relay andATM 517

Chapter 19
Chapter 20
Chapter 21
Chapter 22
Chapter 23
Chapter 24
Chapter 25
Chapter 26
Chapter 27
Chapter 28
Chapter 29
Network Layer 547
Netvvork Layer: Logical Addressing 549
Netvvork Layer: Internet Protocol 579
Netl,vork La.ver: Address Mapping, Error Reporting,
and Multicasting 611
Network Layer: Delivery, Fonvarding, and Routing 647
Transport Layer 701
Process-to-Process Delivery: UDp, TCP, and SCTP 703
Congestion Control and Quality ql’Sen’ice 761
Application Layer 795
Domain Name System 797
Remote Logging, Electronic Mail, and File Transfer 817
WWW and HTTP 851
Network Management: SNMP 873
Multimedia 901
PART 7 Security 929
Chapter 30 Cf}1Jtography 931
Chapter 31 Network Security 961
Chapter 32 Securit}’ in the Internet: IPSec, SSLlTLS, PCp, VPN,
and Firewalls 995

DCN By Behrouz Forouzan pdf free download


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