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2ND_SEM > ITEC_102_PART2_MIDTERM > Flashcards

ITEC_102_PART2_MIDTERM Flashcards

1
Q

Transfer of any of information from one location to another.

Communication means sending a stream of bits or bytes from one location to another via transmission medium such as copper wire, fiber optics, laser, radio, infra red light, bluetooth.

A

Data Transmission

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2
Q

most basic information unit used in computing & information theory, Sing bit is ‘1’/’0’, ‘true/false’,’on/off’.

A

Bit

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3
Q

a series of 8 bits also called a character.

A

Byte

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4
Q

a series of 8 bits also called a _________

A

character

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5
Q

electric or electromagnetic representation of Data

A

Signalscon

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6
Q

convert a message into a signal, which is carried to a receiver by the communication channel

A

Transmitter

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7
Q

Def: are continuous electrical signals that vary with time & represented by a _________.

A

waveform

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8
Q

measure of wavelength at any given point of time ( measured in Volt [V])

A

Amplitude

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9
Q

number of times waveform repeats itself in a second ( measured in Hertz[Hz] )

A

Frequency

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10
Q

distance between two corresponding points on a waveform. ( measured in Meter [m] )

A

Wavelength

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11
Q

progress of a wave over time in relationship to a fixed point or other wave with same frequency / amplitude. ( measured in degree [ degree] ) in relation to starting point.

A

phase

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12
Q

non-continuous & they change in individual steps.

Consists of pulse constant, but there is an abrupt change from one digit to another.

have 2 amplitude levels which represents two voltage pulses. ( 1/0, true/false, high/low )

Positive voltage pulse = , no pulse = 0

Computer is a digital device & they work on digital signals.

A

Digital Signal

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13
Q

signal which is transmitted at input & signal received at output does always match due to transmission channel.

A

Transmission flaws

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14
Q

Unwanted signal which can disturb or harm the communication system.

Common source of noise is electromagnetic interference (EMI) or wave that is emitted from electric carrying cable or electric devices.

A

Noise

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15
Q

Electric motor, power line, copier, television, lights & machines.

A

Source of EMI

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16
Q

Created by the movement / collision of the electrons due to heat in a conductor (wire).

A

Thermal Noise

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17
Q

Caused by varying magnetic field originated from external circuit or equipment. ( engines may also cause this ).

A

Induced noise

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18
Q

pulse(s) appearing at the output point of a data line, which is not transmitted at the input point.

A

Impulse noise

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19
Q

Refers to signal affecting another nearby signal

A

Crosstalk

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19
Q

Device that regenerates digital signal.

A

Repeater

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20
Q

Device with amplify or regenerate analog signal.

A

Amplifier

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21
Q

A signal sent via a transmission media, will lose a portion of its power in form of heat or other form of energy.

A

Attenuation

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22
Q

also known as delay, is an expression of how much time it takes for a packet if data to get from one designated point to another.

A

latency

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23
Q

is the addition of information/signal to an electronic or optical signal carrier.

A

modulation

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24
Q

A device that performs the inverse operation which is demodulation is a ___________.

A

demolulator.

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25
Q

A device that can do both modulation & demodulation is a _______.

A

Modem

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26
Q

the amplitude of voltage applied to the carrier is varied over time.

A

Amplitude modulation(AM)

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27
Q

the frequency of the career waveform in varied in small but meaningful amounts.

A

Frequency modulation(FM)

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28
Q

the natural flow of the alternating current waveform is delayed temporarily.

A

Phase modulation(PM)

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29
Q

transmitting multiple signals over a single communication line or computer channel.

A

Multiplexing

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30
Q

Separates signals by modulating the data onto different carrier frequencies.

A

Frequency division Multiplexing(FDM)

31
Q

separates signals by interleaving bits one after the other.

A

time division multiplexing(TDM)

32
Q

transmission of several bits one after another through a single wire.

A

Serial transmission

33
Q

multiple wires are used form transmitting bits simultaneously.

A

Parallel transmission

34
Q

A technique wide used in personal computers to provide connectivity to printers, modems, fax machines.

Code are sent in untimely manner with uneven intervals between characters

Sending & receiving data is controlled by start & stop bit.

A

Asynchronous transmission

35
Q

Technique of transmission in which the transmitter & receiver are synchronized

Data is transmitted in continuous stream

A

Synchronous transmission

36
Q

Data transmission (2)

A

Bit
byte

37
Q

Types of signals

A

Signals
Transmitter

38
Q

2 types of signals

A

Analog
Digital

39
Q

Waveform is characterized by 4 properties

A

Amplitude
Frequency
Wavelength
Phase

40
Q

Cause of transmission flaws

A

Nosie
Attenuation
Latency

41
Q

Source of EMI

A

Electric motor
power lines
copier
television
lights & machines

42
Q

4 types of noise

A

Thermal Noise
Induced noise
Impulse noise
Crosstalk

43
Q

2 common multiplexing techniques

A

Frequency Division multiplexing(FDM)
Time Division multiplexing(TDM)

44
Q

Types of data transmission

A

Serial transmission
Parallel transmission

45
Q

3 modes of communication

A

Simplex
Half-duplex
full-duplex

46
Q

2 types of transmission modes

A

Asynchronous transmission
Synchronous transmission

47
Q

EMI stands for?

A

Electromagnetic interference

48
Q

it provide additional information about Elements. Values of the Attributes are set inside the Elements

A

Attributes

49
Q

is a set of rules that allow us to specify our own set of elements and attributes.

A

Document type Definition

50
Q

is grammar to indicate what tags are legal in XML documents.

A

Document type Definition

51
Q

is valid if it has an attached DTD and document is structured according to rules defined in DTD.

A

XML Document

52
Q

Serves same purpose as database schema

A

XML Schema

53
Q

Allows creation of user-defined complex
types

A

XML Schema

54
Q

Requirement Same functionality as database query languages (such as SQL) to process Web data

A

XML Query Languages

55
Q

Query selective portions of the document (no need to transport entire document)

A

XML Query Languages

56
Q

Smaller data size mean lesser communication cost

A

XML Query Languages

57
Q

is a language that defines path expressions to locate document data

A

XPath

58
Q

an API used for database connectivity

A

JDBC

59
Q

it provides basic services to manage set of JDBC drivers

A

DriverManager

60
Q

Connection object sends queries to database server after a connection is set up

A

Oracle JDBC

61
Q

Method executes SQL statement that returns ResultSet object (ResultSet maintains cursor pointing to its current row of data. )

A

Oracle JDBC

62
Q

XML was designed to describe data.
( true/false )

A

true

63
Q

XML tags are not predefined unlike HTML
( true/ false)

A

true

64
Q

XML DTD and XML Schema define rules to describe data
(true/false)

A

true

65
Q

XML example of semi structured data
(true/false)

A

true

66
Q

Schemas are written in XML
(true/false)

A

true

67
Q

Set of pre-defined simple types (such as string, integer)
(true/false)

A

true

68
Q

Most databases supports XQuery
(true/false)

A

true

69
Q

XQuery to XML is same as SQL to
RDBMS
(true/false)

A

true

70
Q

DTD stands for?

A

Document Type Definition

71
Q

XML stands for?

A

Extensible Markup Language

72
Q

XML Support in Oracle

A

XDK (XML Developer Kit)
XML Parser for PL/SQL
XPath
XSLT

73
Q

Basic Steps to develop JDBC Application

A

Import JDBC classes (java.sql.*).
Load JDBC drivers
Connect and Interact with database
Disconnect from database

74
Q

JDBC provides following three classes for sending SQL statements to server

A

Statement
PreparedStatement
CallableStatement

75
Q
A

2ND_SEM (23 decks)

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