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EXAM-2 > Data Communications > Flashcards

Data Communications Flashcards

1
Q

In a blank, data can only flow in one
direction, which is usually from the source to the sink.

A

simplex transmission

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1
Q

3 Dataflow Transmission

A

simplex transmission, half-duplex transmission, full-duplex transmission (FDX),

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2
Q

2 Data Transmission

A

Serial data transmission and Parallel data transmission

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2
Q

In a blank data can flow in both directions simultaneously. It can be viewed as a pair of simplex lines between the source and sink with one line going from the source to the sink and the other going from
the sink to the source.

A

full-duplex transmission (FDX),

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3
Q

In a blank , data can flow in both
directions, but never simultaneously. It first flows in one
direction, and then in the other direction.

A

half-duplex transmission

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4
Q

when data is sent or received, the data bits are organized in a specific order since they can only be sent one after another.

A

Serial data transmission

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5
Q

is used when data is transmitted as individual characters. In this method, each character is preceded by one start bit and one or two stop bits that are used by the receiver for synchronization purposes.

A

Asynchronous transmission

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5
Q

is used to transmit large blocks of data at a time. In this scheme, data is usually organized in frames and each frame is preceded by a flag that consists of a few bits and terminated by another flag.

A

Synchronous transmission

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6
Q

multiple data bits are transmitted over multiple channels at the same time.

A

Parallel data transmission

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7
Q

enables the transfer of information between two or more points that are connected by an electrical
conductor

A

Guided media

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8
Q

is a communication channel that carries the information from the sender to the receiver in which
data is transmitted through the electromagnetic signals via copper wire, fiber optics, atmosphere, water, and vacuum

A

Transmission media

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9
Q

refers to the medium and the technology associated with the transmission of information as light pulses along a glass or plastic wire or fiber the optical cable.

A

Optical Fiber

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9
Q

it consists of two insulated copper wires that are typically about 1mm thick and
twisted together in a helical form

A

Twisted Pair

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9
Q

to facilitate two-way communication, the cable bandwidth is split into two
sets of channels: upstream channels and downstream channels.

A

Coaxial Cable

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10
Q

do not require physical links between two or more devices. Wireless communication is based on radio waves communications in the frequency spectrum.

A

Unguided media

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11
Q

These are easy to generate and can penetrate through buildings.

A

Radio waves

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12
Q

The sending and receiving antennas need not be aligned.

A

Radio waves

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12
Q

It is a line of sight (LOS) transmission i.e. the sending and receiving antennas need to be properly aligned with each other. T

A

Microwaves

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13
Q

Infrared waves are used for very short distance communication.

A

Infrared

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13
Q

They cannot penetrate through obstacles.

A

Infrared

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14
Q

It is the metal rod or dish that catches radio waves and turns them into electrical signals feeding into something like a
radio or television or a telephone system.

A

Antennas

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14
Q

It is a directional antenna that is made of a series of dipoles placed along its axis at
different space intervals of time followed by a logarithmic function of frequency.

A

Log Periodic Antennas

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15
Q

This type of antenna uses microwave transmission to broadcast signals between two or more locations

A

Microwave Antennas

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15
Q

It is a directional aperiodic antenna that uses a travelling wave as its guiding structure.

A

Traveling Wave Antennas

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15
Q

These antennas use a length of wire for transmitting and receiving wavelengths of signals.

A

Wire Antennas

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16
Q

A blank is a temporary wave that creates a disturbance and moves along the transmission line at a constant speed.

A

traveling wave

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16
Q

This type of antenna uses microwave transmission to broadcast signals between two or more locations.

A

Microwave Antennas

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17
Q

is a form of electromagnetic radiation that is used mostly in point-topoint communications and radar.

A

Microwave Antennas

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18
Q

It is the range of frequencies contained by a signal.

A

Frequency Spectrum

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19
Q

The following are the frequencies that are designated by the
International Telecommunications Union (ITU).

A

Frequency Spectrum

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19
Q

These waves are basically defined as superimposed oscillations of an electric and a magnetic field in space with their direction of propagation perpendicular to both.

A

Wave Propagation

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20
Q

This is used for a low-frequency range
transmission, mostly less than 1 MHz.

A

Ground Wave

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21
Q

This type of propagation employs the
use of large antennas order of which
is equivalent to the wavelength of the
waves and uses the ground or
Troposphere for its propagation.

A

Ground Wave

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22
Q

This is used for the propagation of EM
waves with a frequency range of 3-30
Mhz.

A

Sky Wave

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22
Q

These waves makes the use of
ionosphere in which it is the ionized
part of the earth’s upper atmosphere.

A

Sky Wave

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23
Q

This is used for a line of Sight communication (LoS).

A

Space Wave

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23
Q

satellite communication and very highfrequency waves use this propagation method.

A

space

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24
Q

is a way of sending multiple signals or streams of information over a communications link at the
same time in the form of a single, complex signal

A

Multiplexing

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25
Q

The receiver recovers the separate signals, a process called blank

A

demultiplexing.

26
Q

The utilization of such media can be increased by allowing multiple users to transmit their data simultaneously, or close
to simultaneously.

A

Media Sharing Technique

26
Q

where the frequency spectrum of the medium is partitioned into
multiple frequency blocks called channels that are assigned to users who can use these channels
simultaneously without interference from each other.

A

Frequency-division multiplexing (FDM)

27
Q

where transmission time is divided into non-overlapping time slots that are
assigned to users.

A

Time-division multiplexing (TDM)

27
Q

where the output signal, which appears like noise, occupies more bandwidth than the
original signal.

A

Spread spectrum (SS)

28
Q

means that each station on the LAN continually listens to (tests) the cable for the
presence of a signal before transmitting.

A

Carrier Sense

28
Q

4 Media Access Methods

A

Carrier Sense Multiple Access with Collision Detection (CSMA/CD),
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA),
Token passing, Demand priority

29
Q

Carrier Sense Multiple Access with Collision Detection (CSMA/CD)

A

Carrier Sense, Multiple Access , Collision Detection

30
Q

means that many computers are attempting to transmit and compete for the
opportunity to send data (i.e., they are in contention)

A

Multiple Access

31
Q

means that when a collision is detected, the stations will stop transmitting and
wait a random length of time before retransmitting the data

A

Collision Detection

32
Q

Instead of detecting and reacting to collisions, CSMA/CA tries to avoid them by having each computer
signal its intention to transmit before transmittin

A

Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)

33
Q

It is a media access method by which collisions are prevented.

A

Token passing

34
Q

Collisions are eliminated under token
passing because only a computer that possesses a free token (a small data frame) can transmit.

A

Token passing

35
Q

In demand priority, an active hub is an essential requirement that can control access to the network.

A

Demand priority

36
Q

The terminals on a network are required to obtain permission from the hub before they start
transmitting the bytes over a network.

A

Demand priority

37
Q

A blank is an architecture used to interconnect two (2) devices together.

A

hardware interface

38
Q

It includes the design of the plug
and socket, the type, and the number and purpose of the wires and the electrical signals that are passed across them.

A

hardware interface

39
Q

2 Characteristics of Interface Standards

A

De facto standard, Composition

40
Q

it is the whole content of an entity of an interface standard

A

Composition

40
Q

it is something that is used so widely that it is considered a standard for a given
application although it has no official status.

A

De facto standard

41
Q

4 Composition

A

Electrical component, Mechanical component, Functional component , Procedural component

42
Q

deals with voltages, line capacitance, and other electrical issues.

A

Electrical component

43
Q

deals with items such as the connector or plugs description.

A

Mechanical component

44
Q

deals with the function of each pin used in an interface.

A

Functional component

45
Q

describes how the circuits are used to perform an operation.

A

Procedural component

46
Q

It is a digital interface that uses a standardized connector
(plug) for all serial and parallel type devices which provides a digital interface and known for being hot-pluggable

A

Universal Serial Bus (USB)

47
Q

It is a type of interconnection between peripheral devices (such as wireless
modems and high-speed digital video cameras) and a microcomputer.

A

Fire Wire

48
Q

It is currently found on Apple laptops and provides a 10-Gbps connection
to peripheral devices

A

Thunderbolt

48
Q

It is an 8-pin connector in which it can be found as the primary connector on
the newer versions of Apple’s iPhone as well as Apple devices such as the iPad.

A

Lightning

49
Q

is like InfiniBand in that it too is a serial, high-speed network that
connects a computer to multiple input/output devices

A

Fibre Channel

49
Q

This interface is used due to its high-speed connection that is mostly found
in networks that require large amounts of peripheral storage

A

InfiniBand

50
Q

is a technique for
interfacing a computer to high-speed devices such as hard disk drives, tape drives, CDs,
and DVDs

A

Small Computer System Interface

51
Q

The sender prepares a data character for transmission, transmits that character with irregular timing, and then begins preparing the next data character for transmission.

A

Asynchronous connection

51
Q

a single character, or byte of data, is the unit of transfer between the sender and receiver.

A

Asynchronous connection

51
Q

Data Link Connections

A

Asynchronous connection, Synchronous connection -

52
Q

the unit of transmission is a sequence of characters. This sequence of characters may be thousands of characters in size with regular timing sent.

A

Synchronous connection

53
Q

The blank capabilities of various media vary differently depending upon the various factors

A

Data Transmission Factors

53
Q

a special kind of data link connection used to support various types of real-time applications such as streaming voice, video, and music.

A

Isochronous connection

53
Q

Data Transmission Factors

A

Bandwidth, Radiation, Noise Absorption, Attenuation

54
Q

refers to the data-carrying capacity of a channel or medium. Higher bandwidth communication channels support higher data rates.

A

Bandwidth

55
Q

refers to the leakage of signal from the medium due to undesirable electrical characteristics of the
medium.

A

Radiation

56
Q

refers to the susceptibility of the media to external electrical noise that can cause distortion of the data signal.

A

Noise Absorption

57
Q

refers to the loss of energy as signal propagates outwards. The amount of energy lost depends on frequency. Radiations and physical characteristics of media contribute to attenuation.

A

Attenuation

58
Q

Bandwidth and Throughput

A

Bandwidth is the measurement of the ability of an electronic communications device or system to send and
receive information. There are two terms:

59
Q

Bandwidth in blank is the range of frequencies contained in a composite signal or the range of
frequencies a channel can pass

A

Hertz

59
Q

is the measurement of the ability of an electronic communications device or system to send and receive information. There are two terms:

A

Bandwidth

60
Q

The term bandwidth can also refer to the number of bits per second that a channel, a link, or even a network can transmit.

A

Bits per Seconds

61
Q

is the amount of data that enters and goes through a system. In layman’s term, it is a measure of how fast we can actually send data through a network.

A

Throughput

62
Q

It is a measure of delay. It measures the time it takes for data to get to its destination across the network

A

Latency

63
Q

Bit Rate and Baud Rate

A

Bit Rate, Baud Rate

64
Q

is the amount of data (number of bits) that can be transmitted per second

A

Bit Rate

65
Q

refers to the number of signal elements or symbol changes that occur per second. A symbol is one of several voltage, frequency, or phase changes.

A

Baud Rate

66
Q

Data Transfer Technique

A

switched network, broadcast network

67
Q

In a blank, data is transferred from source to destination through a series of intermediate switching
nodes. Data passes through a subset of the network nodes.

A

switched network

68
Q

involves establishing a path from source to destination before the commencement of
communication

A

Circuit switching

69
Q

involves organizing data in blocks called packets that are sent in a store-and-forward manner without prior establishment of the communication path.

A

Packet switching

70
Q

In a blank, a transmission from a source is received by all nodes in the network.

A

broadcast network

71
Q

A broadcast network ensures that all the nodes in the network see the transmitted data.

A

broadcast network

EXAM-2 (4 decks)

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