Test 1 (CH 1-6) Multiple Choice

24 July 2022
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The three forces that have driven the architecture and evolution of data communications and networking facilities are:
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Traffic growth, development of services, and advances in technology
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Which of the following is NOT one of the four types of information found on networks?
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Control
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Which of the following is NOT one of the stated trends in technology identified as contributing to increasing traffic and services in networks?
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More and more people are discovering the World Wide Web as a valuable resource
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Among the application services lists given below, which lists the services in order such that the desired throughput rates are increasing?
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Transaction processing, voice, still image transfers, and large file transfers
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Commonly referred to as cell relay, _________ is a culmination of advancements in both circuit switching and packet switching
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Asynchronous Transfer Mode
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Which of the following is NOT one of the main application areas that serve as one of the drivers in determining the design and makeup of enterprise networks?
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Transaction Processing
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The concept that describes the merger of previously distinct telephony and information technologies and markets is called ___________.
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Convergence
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Which of the following is NOT one of the four layers in the model of business-driven convergence?
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Networks
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The types of networks commonly used in businesses today include:
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Local area networks, wide-area networks, and telephone networks
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Which of the following is the most commonly used standard for computer communications?
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TCP/IP
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In the past, the data processing function was organized around a single computer. Today, it is much more common to find many computers linked by networks. This approach to data processing is called:
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Distributed Computing
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Which of the following are emerging enterprise network applications?
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A. video broadcasting and smart objects B. cloud computing and telepresence C. video enriched collaboration and cloud computing D. all of the above
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13. At the ________ level the manager deals with the information network in terms of the services that must be available to ensure that users can take full advantage of the applications that they use.
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Enterprise Services
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__________ is similar to online chat because it is text-based and exchanged bidirectionally in real time.
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Instant Messaging
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__________ allows users in two or more locations to interact simultaneously via two-way video and audio transmission.
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Videoconferencing
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Which of the following represents a digital form of information?
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A watch that displays time as HH:MM
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Which of the following represents the most basic unit of digital information?
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Bit
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Standard voice telephone lines, such as those found in residences, limit bandwidth to:
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300 Hz
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A stereo compact disc typically requires the bandwidth for each channel to be:
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20,000 Hz
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When using data communications with 8-bit codes, the number of alphabetic symbols
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Must be less than 256
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The time interval between when a user presses a key and when the result of that action arrives at his or her workstation is called the:
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Response Time
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In digital systems, the information rate and the capacity of a digital channel are measured in:
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BPS
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Analog information sources include:
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A. sounds B. music C. video D. all of the above
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Historically, the most commonly used text code is the __________, in which each character in this code is represented by a unique 7-bit pattern.
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IRA
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The number of different characters that can be represented in the International Reference Alphabet text code is:
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128
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_________ is capable of representing symbols and characters used in all the major languages spoken around the world.
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UTF-8
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A ________ is the smallest single component of a digital image.
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Pixel
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_________ images are the most common type of image being transmitted over today's enterprise networks.
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Color
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The most widely used format for raster-scan images is referred to as _______.
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JPEG
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_________ screens use thin sandwiches of glass containing a liquid-crystal material to display images.
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LCD
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Which of the following is NOT a feature of an Intranet?
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Can be effectively managed
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Which of the following does distributed processing typically not support?
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Mainframes
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Which of the following is NOT a benefit of distributed data processing?
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Enhanced centralization of data definitions
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Which of the following is not a function provided by servers in client/server systems?
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Data Entry
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The three ways of organizing data for use by an organization are:
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Centralized, replicated, and partitioned
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A data center can occupy:
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A. a single room in a building B. one or more floors C. an entire building D. all of the above
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A DDP facility may include:
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A. a central data center B. satellite data centers C. a community of peer computing facilities D. all of the above
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Which of the following is NOT a requirement for the Corporate Computing Function?
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Deploying technology in ways that make the work productive and not be concerned about whether or not the technology makes work enjoyable for employees
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Which of the following is common in today's data centers?
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A. redundant/backup power supplies B. environmental controls C. data communication connections D. all of the above
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No redundancy guarantees for servers, storage systems, network equipment, and communication connections to Internet or other networks; single path for power and cooling distribution; no redundant components; and availability: 99.671% are _________ characteristics of data centers.
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Tier 1
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With __________ virtualization software is used to allow a piece of computer hardware to simultaneously run multiple operating system images.
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Operating System
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_________ virtualization disguises the complexity of the underlying communications network.
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Network
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Which of the following is a category of ASP business?
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A. functional/specialist B. vertical market C. enterprise D. all of the above
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___________ encompasses any subscription-based or pay-per-use service that extends an organization's existing IT capabilities over the Internet in real time.
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Cloud Computing
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A _________ is a dedicated network that provides access to various types of storage devices including tape libraries, optical jukeboxes, and disk arrays.
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SAN
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Electromagnetic signals:
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Are used for analog and digital signals
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Analog signals differ from digital signals in that:
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Analog signals are continuous while digital signals remain at one constant level and then move to another constant level
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Given a frequency of 60 Hz ( cycles per second ), the period of the signal is:
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0.166667 sec.
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A sine wave is a periodic signal that:
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Can be measured in terms of its amplitude, frequency and phase.
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The wavelength of an analog signal is:
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the distance traveled by the wave in the time defined by its period.
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The spectrum of a signal is:
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the range of frequencies in the signal.
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The bandwidth of a signal is:
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the width of the spectrum.
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The frequency of human speech is in the range of:
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20 - 3400 Hz.
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Given a resolution of 320 pixels x 240 pixels, 1 byte of color information per pixel and a transmission rate of 30 frames per second, calculate the bandwidth necessary for this signal:
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18.4 Mbps
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Delay distortion is due to:
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portions of the signal arriving at the destination at different times
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In general, noise can be defined as:
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unwanted energy or signals on the transmission path
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Signals produced on a line that is the sum or difference of the signals that created it is:
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Thermal Noise
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Because of its characteristics, free space loss is a particular problem in:
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Satellite Transmissions
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Atmospheric absorption occurs because of:
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the water and oxygen content
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_________ is the unwanted coupling between signal paths.
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Crosstalk
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Analog signals are:
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Continuous
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Digital signals are:
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Discrete
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In modern communication systems, data is sent from one point to another via:
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Electromagnetic Signals
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One of the main differences between amplifiers and repeaters is that:
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Amplifiers forward noise as well as data
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An encoding scheme is used:
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in analog transmission to clean up the quality of the transmission
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Each signal change or element is called a:
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Baud
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If a carrier wave is modulated with 4 amplitudes and 4 phase changes, how many possible signal combinations are there?
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16
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A carrier wave is modulated with 4 amplitudes and 4 phase changes; how many bits can be represented with each signal change?
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4
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In Non Return to Zero encoding schemes, the signal or voltage level does not return to 0v (zero volts); one of the problems with this type of encoding is that:
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it is sometimes difficult to synchronize the timing of the transmitter and the receiver.
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Asynchronous transmission includes a start and stop bit with each character transmitted to ensure:
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To allow the receiver to maintain synchronization with the sender
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The efficiency of an asynchronous transmission using 1 stop bit, 1 start bit, and 1 parity bit is:
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70%
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Standards are important when devices must communicate together; the four characteristics governed by these standards are:
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Mechanical, electrical, functional, and procedural
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An error-detecting scheme that employs a unique prime number is called:
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Cyclic redundancy check
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In _________ the phase of the carrier signal is shifted to encode data.
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PSK
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________ is concerned with the content of the signal.
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Digital Transmission
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Which of the following is NOT a common component of an error control process?
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Damaged Frame
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Which of the following is a generic term that describes sharing of a communications channel by multiple communicating stations?
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Multiplexing
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A multiplexing technique where multiple users use distinct carrier frequencies separated such that the modulated signals do not overlap is called ___________.
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Frequency division multiplexing
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A multiplexing technique where multiple users use distinct time slots such that the transmitted bits are shared by all users is called ___________.
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Time division multiplexing
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Present-day television, both broadcast and cable, employ:
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Frequency division multiplexing
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Which of the following is NOT one of the example applications of T-1 leased transmission facilities?
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Cable television systems
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The term "SONET" corresponds to:
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Synchronous optical network
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SONET/SDH signal payload speeds range:
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From 50 Mbps to 1.53 Gbps
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________ is popular for constructing private networks within geographically dispersed organizations and is increasingly used to provide business-user access to public telephone networks
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T-1
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______ is used on SONET to support long-haul voice, data, and video applications over fiber-optic circuits.
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TDM
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Most cordless digital telephone systems used in homes employ ________ or time division duplexing along with FDM.
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TDMA
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Which of the following is a common technique for error control?
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A. error detection B. retransmission after timeout C. positive acknowledgement D. all of the above
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_______ is the most heavily used multiplexing technique and is familiar to anyone who has ever used a radio or television set.
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FDM
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With ________ the light steaming through the fiber consists of many colors, or wavelengths, each carrying a separate channel of data.
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WDM
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________ uses multiple carrier signals at different frequencies, sending some of the bits on each channel.
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DMT