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Midterm Second Sem > ITEC102 > Flashcards

ITEC102 Flashcards

1
Q

The transfer of data or information from one location to another.

A

Data Communication

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2
Q

Elements of Data Communication

A
  • Sender
  • Reciever
  • Medium
  • Message
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3
Q

The computer or device that is used for sending the data from one location to other.

A

Sender or Transmitter

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4
Q

The computer or device that receives the data. It is also known as “sink”.

A

Reciever

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5
Q

The path or link through which data transferred from sender to receiver.

A

Medium

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6
Q

The data or information which is sent from sender to receiver.

A

Message

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7
Q

The path or link through which data is transferred from sender to receiver.

A

Medium

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8
Q

Categories of Data Communication Media

A
  • Guided Media
  • Unguided Media
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9
Q

The physical links through which signals are transferred. These are also called bounded media.

A

Guided Media

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10
Q

The logical links through which signals are transferred. These are the natural parts of environment that can be used to transfer signals in the form of waves.

A

Unguided Media

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11
Q

Data Communication Modes

A
  • Simplex Mode
  • Half Duplex Mode
  • Full Duplex Mode
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12
Q

The data is transmitted in only on direction. A terminal can only send data and cannot receive data or it can only receive data but cannot send it.

A

Simplex Mode

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13
Q

Data can be transmitted in both directions, but only in one direction at a time.

A

Half-Duplex Mode

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14
Q

Data can be transmitted in both directions at the same time

A

Full-Duplex Mode

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15
Q

The transfer of any kind of information from one location to another.

A

Data Transmission

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16
Q

Sending a stream of bits or bytes from one location to another via
transmission medium

A

Communication

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17
Q

Electric or electromagnetic representation of data.

A

Signal

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18
Q

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

A

Transmitter

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19
Q

2 Types of Signal

A
  • Analog Signal
  • Digital Signal
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20
Q

Are continuous electrical signals that vary with time & represented by a waveform.

A

Analog Signal

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21
Q

Waveform is characterized by 4 properties

A
  • Amplitude
  • Frequency
  • Wavelength
  • Phase
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22
Q

Non-continuous & they change in individual steps.

A

Digital Signal

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23
Q

Cause of Transmission Flaws

A
  • Noise
  • Attenuation
  • Latency
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24
Q

Unwanted signal which can disturb or harm the communication system.

A

Noise

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25
Types of Noises
- Thermal Noise - Induced Noise - Impulse Noise - Crosstalk
26
Measure of wavelength at any given point of time. (Measured in Volt [V])
Amplitude
27
Number of times waveform repeats itself in second. (Measured in Hertz[Hz].
Frequency
28
Distance between two corresponding points on a waveform. (Measured in Meter [m]).
Wavelength
29
Progress of a wave over time in relationship to a fixed point or other wave with same frequency amplitude.
Phase
30
Created by the movement/ collision of the electrons due to heat in a conductor (wire).
Thermal Noise
31
Caused by varying magnetic field originated from external circuit or equipment.
Induced Noise
32
pulse(s) appearing at the output point of a data line, which is not transmitted at the input point.
Impulse Noise
33
It refers to signal affecting another nearby signal.
Crosstalk
34
How to eliminate noise?
- Repeater - Amplifier
35
Device that regenerates digital signal.
Repeater
36
Device with amplify or regenerate analog signal.
Amplifier
37
A signal sent via a transmission media, will lose a portion of its power in form of heat or other form of energy.
Attenuation
38
Also known as delay, is an expression of how much time it takes for a packet of data to get from one designated point to another.
Latency
39
It is the addition of information/signal to an electronic or optical signal carrier. A device that performs modulation is a modulator.
Modulation
40
Modulation Methods
- Amplitude Modulation (AM) - Frequency Modulation (FM) - Phase Modulation (PM)
41
The amplitude of voltage applied to the carrier is varied over time.
Amplitude Modulation (AM)
42
The frequency of the career waveform in varied in small but meaningful amounts.
Frequency Modulation (FM)
43
The natural flow of the alternating current waveform is delayed temporarily.
Phase Modulation (PM)
44
Transmitting multiple signals over a single communication line or computer channel.
Multiplexing
45
2 Common Multiplexing Techniques
- Frequency Division Multiplexing (FDM) - Time Division Multiplexing (TDM)
46
It separates signals by modulating the data onto different carrier frequencies.
Frequency Division Multiplexing (FDM)
47
It separates signals by interleaving bits one after the other.
Time Division Multiplexing (TDM)
48
Types of Data Transmission
- Serial Transmission - Parallel Transmission
49
Transmission of several bits one after another through a single wire.
Serial Transmission
50
Multiple wires are used for transmitting bits simultaneously.
Parallel Transmission
51
3 Modes of Communication
- Simplex - Half-Duplex - Full-Duplex
52
2 Types of Transmission Modes
- Asynchronous Transmission - Synchronous Transmission
53
A technique widely used in personal computers to provide connectivity to printers, modems, fax machines etc.
Asynchronous Transmission
54
Technique of transmission in which the transmitter & receiver are synchronized.
Synchronous Transmission
55
XML stands for?
EXtensible Markup Language
56
It is a set of rules that allow us to specify our own set of elements and attributes.
DTD
57
DTD stands for?
Document Type Definition
58
Serves same purpose as database schema.
XML Schema
59
API used for database connectivity.
Java Database Connectivity (JDBC)
60
JDBC stands for?
Java Database Connectivity
61
API stands for?
Application Program Interface
62
are stored as XML Type ( data type for XML) in Oracle
XML Documents
63
It provides basic services to manage set of JDBC drivers.
DriverManager
64
It send queries to database server after a connection is set up.
Connection
65
SQL Statements without parameters.
Statement
66
SQL Statements to be executed multiple times with different parameters.
PreaparedStatement
67
Used for stored procedures.
CallableStatement
68
Basic Steps to Develop JDBC Application
- Import JDBC classes - Load JDBC drivers - Connect and interact with database - Disconnect from database

Midterm Second Sem (4 decks)

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