Chapter 1: arrival to computer Networks and Data Communications

MULTIPLE CHOICE

A ____ is an interconnection that computers and computing equipment using eitherwires or radio waves over little or big geographic areas.a. Personal area network (PAN) c. Wireless networkb. Computer network d. Local area network (LAN)ANS: B PTS: 1 REF: 3

____ is the transmission of multiple signals on one medium.a. Multiplexing c. Modemb. Codec d. Package

ANS: A PTS: 1 REF: 4

____ is the design, installation, and also support the a network and also its hardware andsoftware.a. Convergence c. Data networkb. Voice network d. Network management

ANS: D PTS: 1 REF: 4

____ are the computer systems that store network software and also shared or private user files.a. Switches c. Serversb. Routers d. Hubs

ANS: C PTS: 1 REF: 4

____ are much more advanced gadgets that room replacing hubs and are qualified of filteringout unnecessary traffic.a. Switches c. Serversb. Routers d. Workstations

ANS: A PTS: 1 REF: 4

A ____ is a an equipment that is basically a keyboard and also screen with no permanent storagecapabilities and little, if any, processing power.a. Protocol c. Thick-clientb. Mainframe d. Computer terminal

ANS: D PTS: 1 REF: 10

In a(n) ____ system, a user at a microcomputer, or customer machine, issues a inquiry forsome form of data or service.a. Wireless c. Bridgeb. Client/server d. Internet

ANS: B PTS: 1 REF: 6

A modem and also a dial-up telephone business provides data transfer prices of approximately____.a. 56,000 bits per 2nd (56 kbps) c. 128,000 bits per second (128 kbps)b. 112,000 bits per 2nd (112 kbps) d. 256,000 bits per second (256 kbps)

ANS: A PTS: 1 REF: 7

The internet “talks” only ____, for this reason users need to use software that support this protocol.a. IPX/SPX c. TCP/IPb. DSL d. FTP

ANS: C PTS: 1 REF: 8

The gadgets that usually affix two or much more LANs space the switch, hub, and ____.a. Workstation c. Serverb. Access point d. Router

ANS: D PTS: 1 REF: 4

The personal area network was produced in the so late ____.a. 1970s c. 1990sb. 1980s d. 2000s

ANS: C PTS: 1 REF: 4

A ____ is a high-speed network the interconnects lot of sites within a closegeographic region, such together a large urban area.a. Urban area network (MAN) c. Local area network (LAN)b. Broad area network (WAN) d. An individual area network (PAN)

ANS: A PTS: 1 REF: 3

Connecting two broad area networks requires devices such as high-speed ____.a. Hubs c. Bridgesb. Routers d. Reflectors

ANS: B PTS: 1 REF: 4

The ____ in a network style define a model for the functions or services thatneed to it is in performed.a. Servers c. Routersb. Workstations d. Layers

ANS: D PTS: 1 REF: 13

The global Organization for Standardization (ISO) produced the ____ referencemodel in an attempt to standardize the architecture of interaction systems and also the interoperabilitybetween their components.a. Open up Systems Interconnection (OSI) c. FTPb. TCP/IP d. ASCII

ANS: A PTS: 1 REF: 13

The ____ class of the OSI version makes sure the data received at the an extremely end that atransmission is specifically the same as the data initially transmitted.a. Applications c. Transportb. Conference d. Network access

ANS: C PTS: 1 REF: 17

a. Straightforward Network administration Protocol (SNMP)b. Straightforward Mail deliver Protocol (SMTP)c. Telnetd. Document Transfer Protocol (FTP)

ANS: A PTS: 1 REF: 16

The TCP/IP ____ layer typically uses the Transmission regulate Protocol (TCP) tomaintain one error-free end-to-end connection.a. Network c. Transportb. Network access d. Application

ANS: C PTS: 1 REF: 16

The TCP/IP ____ layer, sometimes dubbed the net layer, is approximately equivalent toOSI’s network layer.a. Network accessibility c. Transportb. Applications d. Network

ANS: D PTS: 1 REF: 16

A(n) ____ connection is a nonphysical connection in between sender and also receiver thatallows an exchange the commands and responses.a. Physics c. Realb. Encapsulated d. Logical

ANS: D PTS: 1 REF: 18

The enhancement of control information come a packet together it moves v the great is called____.a. Encapsulation c. Payloadb. Overloading d. Filtering

ANS: A PTS: 1 REF: 18

The merging together of 2 or an ext businesses or technologies is termeda. Convergence c. Manipulationb. Turning back d. Commercilization

ANS: A PTS: 1 REF: 13

Chapter 2: Fundamentals that Data and also Signals

MULTIPLE CHOICE

____ is entities that convey definition within a computer or computer system.a. Signal c. Impulseb. Data d. EMI

ANS: B PTS: 1

If you desire to deliver data from one point to another, one of two people via a physical wire orthrough radio waves, the data needs to be converted into a(n) ____.a. Hertz c. Signalb. Unicode d. Byte

a. Hertz c. Signalb. Unicode d. Byte

ANS: C PTS: 1

____ are stood for as consistent waveforms that can be in ~ an infinite number ofpoints between some given minimum and also maximum.a. Analog signal c. Digital datab. Digital signal d. Digital pulses

ANS: A PTS: 1

The most common example that ____ data is the human being voice.a. Sampling c. Digitalb. Baud d. Analog

ANS: D PTS: 1

Unfortunately, noise chin occurs together a(n) ____ waveform, and also this provides itchallenging, if not incredibly difficult, to separate noise from an analog waveform the represents data.a. Analog c. Hertzb. Digital d. Byte

ANS: A PTS: 1

____ are discrete waveforms, fairly than consistent waveforms.a. Analog signals c. Digital signalsb. Analog bauds d. Analog data

ANS: C PTS: 1

The three an easy components the analog and digital signals are: amplitude, frequency,and ____.a. Cycles c. Hertzb. Baud d. Phase

ANS: D PTS: 1

The amplitude that a signal can be expressed as volts, ____, or watts.a. Hertz c. Bitsb. Amps d. Bytes

ANS: B PTS: 1

The ____ the a signal is the number of times a signal makes a complete cycle within agiven time frame.a. Step c. Periodb. Amplitude d. Frequency

ANS: D PTS: 1

Cycles every second, or frequency, is stood for by ____.a. Bytes c. Bitsb. Hertz d. Watts

a. NRZ-L c. Differential Manchesterb. Bipolar-AMI d. NRZI

ANS: C PTS: 1

The Manchester encoding schemes are called ____, since the occurrence of aregular shift is similar to seconds ticking top top a clock.a. Continuous-clocking c. Discrete-clockingb. Analog-clocking d. Self-clocking

ANS: D PTS: 1

The variety of times a signal changes value per second is called the ____ rate.a. Hertz c. Wattsb. Baud d. Volts

ANS: B PTS: 1

The data rate is measured in ____.a. Bits per 2nd (bps) c. Bauds per second (bps)b. Bytes per 2nd (Bps) d. Hertz per second (hps)

ANS: A PTS: 1

Using ____, when a machine transmits a binary 0, a zero voltage is sent . Whenthe maker transmits a binary 1, either a confident voltage or a an adverse voltage istransfer .a. Manchester c. Differential Manchesterb. Bipolar-AMI d. NRZ-L

ANS: B PTS: 1

The primary advantage of a bipolar plan is that as soon as all the voltages space addedtogether after ~ a lengthy transmission, there need to be a total voltage that ____.a. -2 c. 0b. -1 d. 1

ANS: C PTS: 1

The Manchester encoding schemes settle the synchronization problem but arerelatively inefficient since they have a baud price that is ____ the bps.a. Equal to c. 3 timesb. Double d. 4 times

ANS: B PTS: 1

A an equipment that modulates digital data onto an analog signal and also then demodulates theanalog signal back to digital data is a ____.a. Repeater c. Hubb. Move d. Modem

ANS: D PTS: 1

Three right now popular modulation techniques for encoding digital data andtransmitting it over analog signals space amplitude change keying, frequency transition keying, and ____ shiftkeying.a. Noise c. Strengthb. Baud d. Phase

a. Noise c. Strengthb. Baud d. Phase

ANS: D PTS: 1

The easiest modulation technique is ____ change keying.a. Amplitude c. Frequencyb. Step d. Noise

ANS: A PTS: 1

Frequency shift keying is subject to ____.a. Baud noise c. Intermodulation distortionb. Bps distortion d. Noise spikes

ANS: C PTS: 1

____ shift keying represents 0s and also 1s by different transforms in the phase of awaveform.a. Amplitude c. Frequencyb. Step d. Noise

ANS: B PTS: 1

____ shift keying incorporates four different phase angles, each of which represents 2bits.a. Quadrature amplitude c. Quadrature noiseb. Quadrature frequency d. Quadrature phase

ANS: D PTS: 1

____ modulation, which is frequently employed in modern-day modems, supplies eachsignal readjust to stand for 4 bits.a. Quadrature amplitude c. Quadrature noiseb. Quadrature frequency d. Quadrature phase

ANS: A PTS: 1

One encoding an approach that switch analog data come a digital signal is ____.a. NRZ-L c. Pulse password modulation (PCM)b. Manchester d. NRZ-I

ANS: C PTS: 1

Tracking an analog waveform and converting it come pulses that represent the wave’sheight above (or below) a threshold is termed ____.a. Pulse amplitude modulation (PAM) c. Quantizationb. Codec d. Quantization levels

ANS: A PTS: 1

When converting analog data come digital signals, the frequency in ~ which the snapshotsare bring away is referred to as the ____ rate.a. Baud c. Bpsb. Sampling d. Byte

a. Classification 1 c. Group 5b. Classification 3 d. Group 7

ANS: C PTS: 1 REF: 63

____ twisted pair wire is offered in environments that have actually a remarkable amount ofelectromagnetic interference.a. Shielded c. Superb. Congealed d. Dilithium

ANS: A PTS: 1 REF: 63

____ is the designation because that a digital telephone circuit the transmits voice or data at544 Mbps.a. ISDN c. VSATb. T-1 d. T-

ANS: B PTS: 1 REF: 63

____ twisted pair to be designed come transmit 10 Mbps that data end a regional area networkfor ranges up to 100 meter (328 feet).a. Group 2 c. Classification 5b. Group 3 d. Group 6

ANS: B PTS: 1 REF: 64

Category 5e twisted pair have the right to run farther than 100 meter from its source to its finaldestination, as lengthy as the signal is regenerated at the very least every ____ meters.a. 20 c. 75b. 50 d. 100

ANS: D PTS: 1 REF: 64

____ twisted pair to be designed come transmit 20 Mbps of data for distances up to 100meters.a. Classification 1 c. Group 4b. Group 3 d. Classification 5

ANS: C PTS: 1 REF: 64

____ twisted pair is designed to support data transmission v signals together high as 200MHz because that 100 meters.a. Group 6 c. Classification 7ab. Classification 7 d. Classification 7e

ANS: A PTS: 1 REF: 64

In a(n) ____ no one of the wires is wrapped with a metal foil or braid.a. Shielded twisted pair (STP) c. CAT 4 twisted pairb. Unshielded twisted pair (UTP) d. CAT 7 twisted pair

ANS: B PTS: 1 REF: 65

____ is a kind in i m sorry a shield is wrapped roughly each cable individually, about allthe wires together, or both.

a. Shielded twisted pair (STP) c. CAT 2 twisted pairb. Unshielded twisted pair (UTP) d. CAT 5 twisted pair

ANS: A PTS: 1 REF: 65

Because of its good shielding properties, ____ is an excellent at transporting analog signal witha wide selection of frequencies.a. CAT 1 cable c. Copper wireb. CAT 2 cable d. Coaxial cable

ANS: D PTS: 1 REF: 67

____ modern technology uses digital signaling in i m sorry the cable carries only one channel ofdigital data.a. Broadband coaxial c. Baseband coaxialb. CAT 7 d. Fiber optic

ANS: C PTS: 1 REF: 67

____ an innovation typically transmits analog signals and also is capable of supportingmultiple networks of data simultaneously.a. Broadband coaxial c. Baseband coaxialb. CAT 7 d. Fiber optic

ANS: A PTS: 1 REF: 67

____ cable ranges in size from around 6 to 10 mm or an ext (1/4 to 3/8 inch) indiameter.a. Slim coaxial c. CAT 2b. Special coaxial d. CAT 3

ANS: B PTS: 1 REF: 67

____ cable is about 4 mm (less 보다 1/4 inch) in diameter.a. CAT 2 c. Thin coaxialb. Thick coaxial d. CAT 3

ANS: C PTS: 1 REF: 67

____ cable contains, as the surname implies, a single copper wire in the facility of thecable.a. Braided coaxial c. Thin-stranded coaxialb. Fiber optic d. Single-stranded coaxial

ANS: D PTS: 1 REF: 67

____ cable is a slim glass cable, a small thicker than a person hair, surrounding by aplastic coating.a. Single-stranded coaxial c. Braided coaxialb. Fiber-optic d. CAT 7

ANS: B PTS: 1 REF: 69

____ cable is virtually impossible to wiretap.a. CAT 1 c. Thick coaxialb. Single-stranded coaxial d. Fiber-optic

a. 3 c. 8b. 6 d. 15

ANS: D PTS: 1 REF: 75

____ transmission solution are comparable to terrestrial microwave systems except that thesignal travels from a ground terminal on planet to a satellite and ago to another ground station on Earth.a. Satellite microwave c. Downlinkb. To move d. Terrestrial microwave

ANS: A PTS: 1 REF: 75

The closer a satellite is to the Earth, the much shorter the times forced to send data come thesatellite, the is, come ____.a. Downlink c. Downloadb. Uplink d. Send down

ANS: B PTS: 1 REF: 75

The infection time from when a signal an initial leaves a satellite and also then arrives at aground station is referred to as ____.a. Propagation hold-up c. Uplinkb. Downlink d. Upload

ANS: A PTS: 1 REF: 75

____ satellites room closest to the Earth.a. Low-Earth-orbit (LEO) c. Geosynchronous-Earth-orbit (GEO)b. Middle-Earth-orbit (MEO) d. Highly-elliptical-Earth-orbit (HEO)

ANS: A PTS: 1 REF: 76

____ satellites deserve to be found approximately 1000 come 3000 miles from the Earth.a. Low-Earth-orbit (LEO) c. Geosynchronous-Earth-orbit (GEO)b. Middle-Earth-orbit (MEO) d. Highly-elliptical-Earth-orbit (HEO)

ANS: B PTS: 1 REF: 76

A satellite device that has distinct properties is the ____ satellite, i m sorry is provided bygovernments for spying and also by clinical agencies for observing celestial bodies.a. Low-Earth-orbit (LEO) c. Geosynchronous-Earth-orbit (GEO)b. Middle-Earth-orbit (MEO) d. Highly-elliptical-Earth-orbit (HEO)

ANS: D PTS: 1 REF: 76

Cells, in a cellular telephone system, can selection in dimension from one-half mile in radius to____ mile in radius.a. 25 c. 50b. 35 d. 70

ANS: C PTS: 1 REF: 80

____ was the first-generation to move telephone system.a. Personal Communications services (PCS)b. Time division Multiple access (TDMA)c. Progressed Mobile Phone business (AMPS)

b. Time department Multiple accessibility (TDMA)c. Progressed Mobile Phone company (AMPS)d. An international System because that Mobile (GSM) Communications

ANS: C PTS: 1 REF: 82

The ____ device is an example of a single-user earth station satellite mechanism with itsown ground station and a little antenna (two to 6 feet across).a. T1 c. VSATb. LEO d. SAT-V

ANS: C PTS: 1 REF: 77

The an initial PCS an innovation used a form of time department multiplexing called ____.a. Code division Multiple accessibility (CDMA)b. Time department Multiple access (TDMA)c. Worldwide System because that Mobile (GSM) Communicationsd. Digital-Advanced cell phone Phone business (D-AMPS)

ANS: B PTS: 1 REF: 83

The 3rd PCS technology was ____ and also used a different kind of time divisionmultiple accessibility technology.a. Global System for Mobile (GSM) Communicationsb. Time division Multiple access (TDMA)c. Code division Multiple accessibility (CDMA)d. Digital-Advanced mobile Phone service (D-AMPS)

ANS: A PTS: 1 REF: 83

____ is a broadband wireless transmission modern technology that is based upon a collection ofIEEE standards.a. WiFi c. IrDAb. Bluetooth d. WiMAX

ANS: D PTS: 1 REF: 83

____ systems transmit data end a wide variety of frequencies fairly than limitingtransmissions come a narrow, addressed band that frequencies.a. WiFi c. Ultra-widebandb. Bluetooth d. Complimentary space optics

ANS: C PTS: 1 REF: 86

____ systems are good at sending out low-speed signal over quick to medium distances.a. Microwave c. WiFib. Satellite d. ZigBee

ANS: D PTS: 1 REF: 86

The famous GPS gadgets that human being use to discover directions while driving usage whichtype the satellite system?a. LEO c. GEOb. MEO d. HEO

a. Data communicating equipment (DCE) c. Data transmitting equipment (DTE)b. Data terminating devices (DTE) d. Data receiving tools (DRE)

ANS: A PTS: 1 REF: 104

To define functional and also procedural components, EIA-232F incorporates the ITU’s____ standard.a. ISO 2110 c. RS-b. V.28 d. V.

ANS: D PTS: 1 REF: 104

A ____ link is one in i m sorry both sender and receiver may transmit at the sametime.a. Full-duplex c. Single-duplexb. Half-duplex d. Multi-duplex

ANS: A PTS: 1 REF: 105

Some systems, for miscellaneous reasons, permit only one next or the various other to transmit in ~ onetime. This type of link is an example of a ____ connection.a. Full-duplex c. Single-duplexb. Half-duplex d. Multi-duplex

ANS: B PTS: 1 REF: 105

The idea behind ____ is that the peripheral can simply be plugged in and also turned on,and that the computer should dynamically recognize the maker and develop the interface.a. RS-232 c. Daisy-chainingb. EIA-232F d. Warm plugging

ANS: D PTS: 1 REF: 104

The ____ ingredient of USB strictly specifies the exact dimensions that the interface’sconnectors and also cabling.a. Procedural c. Mechanicalb. Sensible d. Electrical

ANS: C PTS: 1 REF: 105

A(n) ____ is merely a high-speed link to i m sorry multiple tools can attach.a. Pin c. Circuitb. Bus d. Interface

ANS: B PTS: 1 REF: 105

FireWire support two species of data connections: an asynchronous connection and also a(n)____ connection.a. Synchronous c. Parallelb. Timed d. Isochronous

ANS: D PTS: 1 REF: 106

____ is a technique for interfacing a computer to high-speed tools such as hard diskdrives, ice drives, CDs, and also DVDs.a. Serial c. SCSIb. RS-232 d. EIA-232F

a. Serial c. SCSIb. RS-232 d. EIA-232F

ANS: C PTS: 1 REF: 107

SCSI is a ____ interface and not just an interface technique for tough disk drives.a. Systems c. Serverb. Terminal d. Driver

ANS: A PTS: 1 REF: 107

You can connect up come ____ various SCSI gadgets to one SCSI adapter.a. 2 c. 6b. 4 d. 7

ANS: D PTS: 1 REF: 107

____ is a serial link or bus the can carry multiple networks of data in ~ the sametime.a. InfiniBand c. SCSIb. Fibre Channel d. USB

ANS: A PTS: 1 REF: 107-

InfiniBand have the right to support data deliver speeds that ____ every second.a. 1.5 billion bits (1.5 gigabits) c. 5 billion bits (5 gigabits)b. 2.5 exchange rate bits (2.5 gigabits) d. 10 exchange rate bits (10 gigabits)

ANS: D PTS: 1 REF: 107-

InfiniBand can attend to (interconnect) ____ the devices, making use of both copper cable andfiber-optic cables.a. Tens c. Thousandsb. Hundreds d. Millions

ANS: C PTS: 1 REF: 107-

Fibre Channel can support the interconnection of as much as ____ gadgets only.a. 56 c. 256b. 126 d. 512

ANS: B PTS: 1 REF: 108

To prepare a data character for transmission, a ____ little is added to the start ofthe character and informs the receiver the an just arrive data framework is arriving.a. Begin c. Endb. Avoid d. Parity

ANS: A PTS: 1 REF: 109

At the finish of the data character, one or two ____ bits are included to signal the end of theframe.a. Begin c. Checkb. Parity d. Stop

ANS: D PTS: 1 REF: 109

Chapter 5: Making relationships Efficient: Multiplexing and Compression

MULTIPLE CHOICE

Presently, a medium deserve to be separated in three an easy ways: a department of ____, a divisionof time, and a division of transmission codes.a. Frequencies c. Wavelengthb. Amplitudes d. Direction

ANS: A PTS: 1 REF: 120

____ is the assignment the nonoverlapping frequency varieties to each “user” the amedium.a. Time division multiplexing (TDM) c. Amplitude division multiplexing (ADM)b. Transmission code multiplexing (TCM) d. Frequency division multiplexing (FDM)

ANS: D PTS: 1 REF: 120

To enable multiple individuals to share a single medium, FDM assigns every user a separate____.a. Time slot c. Channelb. Transmission password d. Amplitude

ANS: C PTS: 1 REF: 120

First-generation cellular telephone equipment allocated networks using frequency rangeswithin the 800 to ____ megahertz (MHz) spectrum.a. 830 c. 930b. 900 d. 960

ANS: B PTS: 1 REF: 121

The device that is attached to the receiving finish of the medium and also splits off eachsignal to deliver it to the suitable receiver is referred to as the second multiplexor, or ____.a. Multiplexor c. Splitxorb. Endplexor d. Demultiplexor

ANS: D PTS: 1 REF: 122

In FDM, ____ take up frequencies that can be supplied for various other data channels, thusintroducing a details level that wastefulness.a. Guard bands c. Multiplexorsb. Networks d. Demultiplexors

ANS: A PTS: 1 REF: 122

Since time department multiplexing was introduced, it has separation into two around parallelbut separate technologies: synchronous time division multiplexing and ____ time divisionmultiplexing.a. Addressed c. Inverseb. Statistical d. Empirical

ANS: B PTS: 1 REF: 123

____ offers each incoming resource signal a rotate to it is in transmitted, proceeding through

the resources in round-robin fashion. A. Statistical time department multiplexing (Stat TDM) b. Empirical time department multiplexing (ETDM) c. Synchronous time department multiplexing (Sync TDM) d. Addressed time department multiplexing (FTDM)

ANS: C PTS: 1 REF: 123

Under normal circumstances, the synchronous time division multiplexor maintains asimple ____ sampling order of the intake devices.a. Round-robin c. LIFOb. FIFO d. FILO

ANS: A PTS: 1 REF: 123

Three types of synchronous time department multiplexing the are popular today space T-multiplexing, ____ multiplexing, and also SDH.a. EIA-232F c. SONETb. IPS/SPX d. RS-

ANS: C PTS: 1 REF: 125

In the 1960s, AT&T created a organization known as ____, which multiplexed digital dataand digitized voice top top a high-speed telephone line v a data price of 1.544 megabits every second.a. ISDN c. SONETb. T-1 d. SDH

ANS: B PTS: 1 REF: 125

____ multiplexing is the multiplexing an approach used to assistance SONET.a. FDM c. Frequency divisionb. ADM d. Synchronous time division

ANS: D PTS: 1 REF: 126

A ____ multiplexes 24 input networks together ~ above one high-speed telephone line.a. T-1 device c. SDH systemb. SONET device d. Congruent system

ANS: A PTS: 1 REF: 126

A T-1 system multiplexes ___ into each frame.a. A single ASCII personality c. A single SYNC bitb. A solitary LENGTH byte d. A solitary SYNC byte

ANS: C PTS: 1 REF: 125

SONET was occurred in the United claims by ____.a. ISO c. IEEEb.


You are watching: The ____ was not created by a standards-making organization but by a group of computer scientists.


See more: William Levitt, With The Help Of The Gi Bill, Gave Many Americans The Opportunity To

ANSI d. IETF

ANS: B PTS: 1 REF: 126