Business Data Communications and Networking, 14th Edition By Jerry FitzGerald
CHAPTER 1 INTRODUCTION TO DATA COMMUNICATIONS Chapter Summary This chapter introduces the students to the concept of data communications in business. It describes why it is important to study data communications and introduces you to the three fundamental questions that this book answers. Next, it discusses the basic types and components of a data communication network. Also, it examines the importance of a network model based on layers. Finally, it describes the three key trends in the future of networking and the importance of cyber security.
Learning Objectives • • • • • • • •
Be aware of the three fundamental questions this book answers Be aware of the applications of data communications networks Be aware of how data communications fit within the discipline of MIS Be familiar with the major components of and types of networks Understand the role of network layers Be familiar with the role of network standards Be aware of cyber security issues Be aware of three key trends in communications and networking
Instructor’s Manual to Accompany: Business Data Communications and Networking, 14e by Fitzgerald/Dennis/Durcikova
Key Terms American National Standards Institute (ANSI) Application layer Attacks Backbone network (BN) Bring Your On Device (BYOD) Browser-based Cable Circuit Client Cyber security Data link layer Extranet File server Hardware layer Institute of Electrical and Electronics Engineers (IEEE) International Telecommunications UnionTelecommunications Group (ITU-T) Internet Engineering Task Force (IETF) Internet model Internet of Things (IoT) Internet service provider (ISP)
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Internetwork layers Intranet Layers Local area network (LAN) Mail server Native apps Network of Things (NoT) Network layer Open Systems Interconnection Reference model (OSI model) Peer-to-peer networks Physical layer Protocol Protocol Data Unit (PDU) Protocol stack Request for Comment (RFC) Router Server Standards Switch Transport layer Web server Wide area networks (WAN) Wireless access point
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Instructor’s Manual to Accompany: Business Data Communications and Networking, 14e by Fitzgerald/Dennis/Durcikova
Chapter Outline 1.1 Introduction 1.2 Data Communications Networks 1.2.1 Components of a Network 1.2.2 Types of Networks 1.3 Network Models 1.3.1 Open Systems Interconnection Reference Model 1.3.2 Internet Model 1.3.3 Message Transmission Using Layers 1.4 Network Standards 1.4.1 The Importance of Standards 1.4.2 The Standards-Making Process 1.4.3 Common Standards 1.5 Future Trends 1.5.1 Wireless LAN and BYOD 1.5.2 The Internet of Things 1.5.3 Massively Online 1.6 Implications for Cyber Security Summary
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Instructor’s Manual to Accompany: Business Data Communications and Networking, 14e by Fitzgerald/Dennis/Durcikova
Answers to Textbook Exercises Answers to End-of-Chapter Questions 1. How can data communication networks affect businesses? Data communication networks can affect businesses by being the foundations for distributed systems in which information system applications are divided among a network of computers. Data communication networks facilitate more efficient use of computers and improve the day-to-day control of a business by providing faster information flow, aiding strategic competitive advantage. They also provide message transfer services to allow computer users to talk to one another via electronic mail. 2. How do data communications networks support the four core capabilities of MIS? The four core areas are: 1) storing and retrieving data, 2) analyzing and visualizing data, 3) automating data operations, and 4) protecting data. Storing and retrieving data is handled using database. There are many different kinds of databases. The most frequently used database in organizations is an SQL database. Analyzing and visualizing data is handled by retrieving the data from a database and importing it into a software program like Excel, Tableau, or PowerBI so that these business questions can be answered using a variety of techniques Automating data operations we have a wide variety of IT we can buy or build using a variety of programming languages. For protecting data, organizations must spend resources to protect their data and ensuring the confidentiality, integrity, and availability of the data. In order for the IT strategy to implement the core capabilities, data communications and networking infrastructure must be available. 3. Discuss three important applications of data communications networks in business and personal use. Three important applications of data communication networks in business and personal use include email, videoconferencing, and the Internet. 4. How do LANs differ from WANs, and BNs? A Local Area Network (LAN) is a group of microcomputers or terminals located in the same general area. A Backbone Network (BN) is a large central network that connects most everything on a single company site. A Metropolitan Area Network (MAN) encompasses a city or county area. A Wide Area Network (WAN) spans cities, states, or national boundaries. Typically, MANs and WANs used leased facilities, while LANs and BNs are often located internally in an organization and used owned facilities.
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