Solutions manual digital business networks 1st edition allen dooley

Solutions Manual Digital Business Networks 1st Edition by Allen B Dooley Link full download: https://getbooksolutions.com/download/solution-manual-for-digitalbusiness-networks-1st-edition-by-dooley/ Chapter Elements of Data Communications: Analog and Digital Chapter Outline 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 1.14 1.15 The Business Benefit Learning Objectives The Changing World of Communications Five Phases of Data Communication Evolution Defining Data Communications Protocols The Ethical Perspective Standards Standard Setting Bodies Chapter Summary Keywords Short-Answer Questions Hands-On Projects Research in Brief Topic in Focus: A Closer Look at the IEEE Learning Objectives ■ Identify five phases in the evolution of data communications ■ Explain the difference between data communications and telecommunications ■ Understand what a protocol is and why protocols are used ■ Recognize the importance of standards and standards-setting bodies ■ Identify the OSI and TCP/IP networking models Chapter Summary Five phases characterize the evolution of data communications over the past five decades: (1) digitization, (2) expansion, (3) deregulation, (4) Internet as a common tool, and (5) pervasive computing Technology continues to change, altering our definition of what is meant by “communications.” Data communications is a subset of telecommunications Whereas telecommunications involves such technologies as telephony and television, traditional data communications is more concerned with the transmission of data between computers and computer networks In the transmission of data from one location to another, data are first transformed using binary coding schemes Binary coding schemes use the binary digits and 1, which are called bits, to represent data Data communications uses protocols, or rules, that establish how the communications occur There are many different types of protocols that fulfill different purposes and functionalities Protocols state how the data are to be formatted, how the format is to be interpreted, the rate at which the data are to be transmitted, and whether communications between two devices can be established Protocols become established or defined through a standards process Both formal and informal standards exist The trend is for standards to be open and publicly available for all to use There are numerous standards-setting bodies; many of them are nongovernmental, private nonprofit organizations Networks have both physical and logical components—respectively, the hardware devices that compose them and the software that drives them Networks are also based on models Two major models used in data communications are the Open Systems Interconnection, or OSI, model and the Transmission Control Protocol/Internet Protocol, or TCP/IP, model Keywords ARPANET Binary Data communications De facto standard Deregulation Digitization Encoding scheme Internet IPv4 IPv6 Nonproprietary Pervasive technology Proprietary Protocol Standards Telecommunications Telemetry Short-Answer Questions What are open standards, and what, if any, are the advantages of such standards? Open standards are a nonproprietary standard that establishes the essential rules, functionalities, and operations a protocol must fulfill What is a protocol and why would one be used? Provide an example of a technological protocol or a society-based protocol Protocols are the rules that determine how devices communicate Language protocols, called rules of grammar, make it possible for people who speak and read the same language to understand one another How formal standards differ from de facto standards? Unlike de facto standards, formal standards are those standards that have been authorized by either an officially recognized body or by law and regulation What are the five phases associated with the evolution of data communication networks? Digitization in the 1960s Growth of data communications in the 1970s An era of deregulation in the 1980s The Internet as a common tool in the 1990s Pervasive computing in the 2010s With what scale of network is the IEEE associated? Local area networks What organization is the principal standards-setting body in the United States? The American National Standards Institute (ANSI) What is an encoding scheme? An encoding scheme is a way of transforming one type of data or information into another What is telemetry? Telemetry is the wireless transmission and reception of data for the purpose of remotely monitoring environmental conditions or equipment parameters Hands-On Projects, Research in Brief, and Case Study Answers for these three text elements will vary depending on what an individual student or study group elects for these assignments Assignments should be evaluated for relevancy, accuracy, content, and appropriate use of language The case study in particular lends itself to a small group project Chapter Networking Models: OSI and TCP/IP Chapter Outline 2.1 2.2 2.3 2.4 2.5 2.4 2.5 2.6 2.7 2.8 2.11 2.12 2.13 2.14 2.15 2.16 The Business Benefit Learning Objectives Networking Models Open Architectures Layered Architectures Open Systems Interconnection (OSI) The Ethical Perspective Transmission Control Protocol/Internet Protocol (TCP/IP) Networking Categories Chapter Summary Keywords Short-Answer Questions Hands-On Projects Research in Brief Case Study Questions Topic in Focus: How the Layers Work Learning Objectives ■ Explain networking models ■ Describe open architectures ■ List the benefits of layered architectures ■ Understand the OSI networking model ■ Understand the TCP/IP networking model ■ Identify four general categories of networks Chapter Summary Networks have both physical and logical components: the hardware devices that compose them and the software that drives them Networks are also based on models Open architecture models have some of the same advantages as open standards Two major models used in data communications are the open systems interconnection, or OSI, model and the transmission control protocol/Internet protocol, or TCP/IP, model The two models share several characteristics, and each model is well established and accepted by the data and telecommunications industries One of the most important features they share is that both models are based on the concept of layered architectures A model is based on theory The theoretical model must then be implemented into a physical data communications network In general, a network falls into one of four categories, based on the network’s characteristics A local area network (LAN) is usually contained within a limited geographic area A backbone network (BN) is usually a high-speed circuit that connects the various LANs within an enterprise A metropolitan area network (MAN) can connect BNs and LANs Wide area networks (WANs) are used to transport data over great geographic distances, such as across a state, a country, or even the globe Keywords Application layer 17 Backbone network (BN) 22 Cloud 24 Common carrier 24 Compression 18 Data link layer 18 Encryption 18 Enterprise 22 Layer stack 17 Layered architecture 16 Local area network (LAN) 22 Logical addressing 18 Metropolitan area network (MAN) 23 Network layer 18 Networking model 15 Open architecture technology 16 Open system interconnection (OSI) model 16 Physical layer 19 Presentation layer 18 Session layer 18 Transmission control protocol/Internet protocol (TCP/IP) model 16 Transport layer 18 Wide area network (WAN) 24 Short-Answer Questions What are open standards, and what, if any, are the advantages of such standards? Open standards are a nonproprietary standard that establishes the essential rules, functionalities, and operations a protocol must fulfill In general, why would a layered architecture be viewed as beneficial? Each layer within a model has its own particular and specific responsibilities and functionalities As such a given layer does not need to be informed as to how other layers function What is a protocol and why would one be used? Protocols are the rules that determine how devices communicate such that a sending and receiving device are able to exchange data and information What are the four different types of networks? Local Area Networks Backbone Networks Metropolitan Area Networks Wide Area Networks How many layers make up the OSI model? Seven layers make up the OSI model Which layer in the TCP/IP model is closest in alignment with the OSI model? The physical layer is closest in alignment with the OSI model What is the purpose of the application layer in the TCP/IP model? This layer is also sometimes referred to as the process layer and is where a protocol stack interfaces with processes on a host machine, enabling that host to communicate across the network What is the largest scale networking category? Wide Area Network is the largest scale networking category Hands-On Projects, Research in Brief, and Case Study Answers for these three text elements will vary depending on what an individual student or study group elects for these assignments Assignments should be evaluated for relevancy, accuracy, content, and appropriate use of language The case study in particular lends itself to a small group project Chapter Physical Layer Fundamentals: Concepts and Components Chapter Outline 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 The Business Benefit Learning Objectives Physical Layer Concepts Physical Layer Components Signal Methods Transmission Modes Circuit Configuration Bandwidth Data Flow Chapter Summary Keywords Short-Answer Questions Hands-On Projects Research in Brief Case Study Questions Topic in Focus: Complex Signal Modulation Learning Objectives ■ Understand the general purpose of the physical layer ■ Identify four components of the physical layer ■ Describe the differences between analog and digital signaling ■ Understand amplitude, frequency, and phase modulation in analog signaling ■ Describe the differences between simple and complex analog signaling ■ Understand general digital signal encoding schemes ■ Describe two digital transmission modes ■ Explain two circuit configurations ■ Explain three methods of data flow Chapter Summary The physical layers of the OSI and TCP/IP models are virtually the same The physical layer identifies the physical characteristics of the network These characteristics include the types of cables and connectors used to link devices Transmission properties are also defined at the physical layer that indicates the ways in which a binary or signal is to be represented in either an analog or digital encoding scheme A or can be represented either electronically or optically Four important physical layer components are: (1) the signaling methods used for conveying or representing data and translating between them; (2) the circuit configuration used to carry the data; (3) the transmission medium used, wired or wireless, on which the circuits are based; and (4) the devices typically associated with this layer Data can be represented as analog or digital signals In analog communications, signals flow across a copper wire in the form of electromagnetic waves Analog signals can also use transmission media such as fiber optics or wireless (radio, microwave, infrared) Digital signaling is more straightforward than analog signaling With digital signaling, only two values are used: and With analog signaling, modulation techniques include amplitude, frequency, and phase These modulation techniques can be simple or complex For digital signaling, encoding schemes such as bipolar, biphase, Manchester, and Differential Manchester are used Whether analog or digital, signals are carried over a transmission medium The transmission medium has a circuit configuration— point-to-point or multipoint—and a data flow—simplex, half-duplex, or full-duplex Based on the needs and size of the network, one or all of these might be used Keywords Amplitude modulation 35 Analog 34 Attenuation 38 Backward compatible 41 Bandwidth 44 Biphase 39 Bipolar 39 Bit interval 38 Bit rate 38 Circuit configuration 43 Clocking 38 Cycle 36 Data flow 45 Discrete 38 Effective 34 Efficient 34 Frame 33 Frequency modulation 35 Full-duplex 45 Gigahertz 37 Half-duplex 45 Hertz 37 Kilohertz 37 Megahertz 37 Multipoint 43 Parallel transmission mode 41 Period 36 Phase modulation 37 Point-to-point 43 Self-clocking 39 Serial transmission mode 41 Signaling method 34 Simplex 45 Symbol rate 38 Terahertz 37 Transition coding 39 Unipolar 39 Short-Answer Questions In general, what purpose does the physical layer serve? The physical layer is responsible for transmitting this unformatted bit stream across a transmission medium, from one device to another, until ultimately the data bits travel from sender to receiver Describe at least three ways in which digital signaling differs from analog Digital signals use discreet representation, are usually less expensive than analog signaling, and are more susceptible to attenuation How does a point-to-point circuit differ from a multipoint one? A point-to-point circuit is a dedicated circuit between two devices A multipoint circuit is a shared circuit for multiple communicating devices What is meant by attenuation? Attenuation can be defined as the weakening of a signal’s strength as it travels through a circuit What other layer does the physical layer interface directly with? Data link layer What relationship frequency and period have with regard to frequency modulation? Frequency modulation (FM) uses frequency, the number of waves per second, to differentiate between the binary values and Frequency modulation also has an element called the period, which is the amount of time, in seconds, that a signal needs to complete one cycle A cycle is the completion of one full pattern of a wave 7 Which modulation method is most susceptible to noise and distortion during transmission? Amplitude In what critical way does bipolar encoding differ from unipolar encoding? Bipolar encoding uses positive, negative, and zero voltages Unipolar encoding has a direct current (DC) component It uses either a positive or negative voltage, but never both, to represent one value, usually a binary 1, and zero voltage to represent a second value, usually binary Hands-On Projects, Research in Brief, and Case Study Answers for these three text elements will vary depending on what an individual student or study group elects for these assignments Assignments should be evaluated for relevancy, accuracy, content, and appropriate use of language The case study in particular lends itself to a small group project  ... and information What are the four different types of networks? Local Area Networks Backbone Networks Metropolitan Area Networks Wide Area Networks How many layers make up the OSI model? Seven... general categories of networks Chapter Summary Networks have both physical and logical components: the hardware devices that compose them and the software that drives them Networks are also based... private nonprofit organizations Networks have both physical and logical components—respectively, the hardware devices that compose them and the software that drives them Networks are also based on