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net tech > Handout 1 > Flashcards

Handout 1 Flashcards

1
Q

act of transmitting and exchanging information between people, people and objects, and objects and objects through various media and actions

A

communication

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2
Q

has ultimate purpose of helping people communicate more efficiently and create better lives from it

A

communication

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3
Q

largest computer network in the world

A

internet

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4
Q

largest computer network in the world

A

internet

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5
Q

meaning of ARPAnet

A

Advanced Research Projects Agency Network

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6
Q

when was ARPAnet born

A

1989

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7
Q

refers to communication between terminal devices through a computer network

A

network communication

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8
Q

uses of signal

A

means of communication
communicated information
electronic transmitted information

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9
Q

this refers to a sign or indication that conveys information about something or that tells someone to do something

A

means of communication

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10
Q

refers to an event or act, which shows that something exists or that gives information about something

A

communicated information

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11
Q

refers to a detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted via telegraphy, telephony, radio, radar, or television

A

electronic transmitted information

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12
Q

examples of signals

A

electrical signals
acoustic signals
video signals
biological signals
noise

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13
Q

signal that refers to voltages and currents in a circuit

A

electrical signals

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14
Q

signal that refers to audio or speech signals

A

acoustic signals

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15
Q

signal that refer to intensity variations in an image

A

video signals

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16
Q

signal that is interference/unwanted and undesired form of signal

A

noise

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17
Q

refer to disturbances in that energy to travel through a medium from one location to another

A

waves

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18
Q

refers to the horizontal distance of a wave from a point to the corresponding point on the next wave

A

wavelength

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19
Q

wavelength is measure in

A

meters (m)

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20
Q

refers to a vertical distance from a given point on the wave from the horizontal axis, it is the height above and below the x-axis

A

amplitude

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21
Q

amplitude is measured in

A

volts, amperes, or watts

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22
Q

it describes the position of the waveform relative to time zero; it relative to some fixed reference point or another sine wave.

A

phase

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23
Q

refers to the number of waves made per second or as cycles per second, it is the reciprocal of the period to complete one (1) wave cycle. The unit for frequency is in Hertz (Hz); 1 Hz means 1 cycle per second (cps).

A

frequency

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24
Q

refers to the amount of time (expressed in seconds) required to complete one (1) full cycle

A

period

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25
Q

general categories of waves

A

analog
digital

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26
Q

a wave in which both the amplitude and time continuously vary over their respective intervals that results in a wavy characteristic. Examples of this wave include the human voice and music.

A

analog wave

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27
Q

a wave with several discrete (jumpy) states, such as high or low, and on or off. It has fixed amplitude, but its pulse width and frequency can be changed. An example of this signal is the data stored in the memory of a computer in the form of Os and 1s.

A

digital wave

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28
Q

Computers facilitate information exchange and resource sharing from one location to another through some sort of wiring/cabling or waves that act as a physical path, which carries electrical or electromagnetic signals between a transmitter and a receiver

A

networking media

29
Q

These networking media use cables and are limited by physical geography

A

wired or bounded media

30
Q

media, these networking media cables in transmitting data and is not bounded by physical geography

A

wireless or unbounded media

31
Q

transmission modes

A

simplex
half-duplex
full-duplex

32
Q

a connection wherein data flows in one (1) direction only (unidirectional). This type is either transmit-only or receive-only

A

simplex mode

33
Q

a connection wherein data can flow in both directions, but not simultaneously over a shared physical medium

A

half-duplex mode

34
Q

is a connection wherein data simultaneously flows in both directions

A

full-duplex mode

35
Q

is a transmission in which data with each bit lining up in a series as the bits are sent over a single wire at a time

A

serial transmission

36
Q

a transmission wherein a group of bits is sent simultaneously, but each uses a different channel

A

parallel transmission

37
Q

The most widely used standard for serial data communications is which is intended to operate over distances of up to 50 feet and has a communication speed that is equal to or less than 20Kbps

A

serial cable

38
Q

refers to two (2) conductors enclosed by an insulating protective coating

A

coaxial cable

39
Q

types of coaxial cable

A

thin (thinnet) cable
thick (thicknet) cable

40
Q

it is a flexible coaxial cable about 0.25 inches thick. It uses British Naval Connector (BNC)-T cable connector attached to LAN Card (NIC)

A

thin (thinnet) cable

41
Q

relatively rigid coaxial cable about 0.5 inches in diameter. It uses vampire top or piercing top as connectors.

A

thick (thicknet) cable)

42
Q

consists of twe insulated strands of copper wire that are arranged in a regular spiral pattern.

A

twisted pair cable

43
Q

refers to a twisted pair cable that contains no shielding.

A

unshielded twisted-pair cable (UTP)

44
Q

It has eight (8) individual copper wires, in which pairs of them are twisted around each other

to form a four-pair color-coded wire medium that is encased in a flexible plastic sheath

A

UTP

45
Q

refers to signal loss due to impedance

A

attenuation

46
Q

refers to the twisted-wire pairs producing a magnetic field cancellation effect, which limits signal degradation caused by interference from nearby twisted pairs

A

crosstalk

47
Q

refers to a twisted pair cable that combines the techniques of twisting wires, cancellation, and shielding

A

shielded twisted-pair cable (STP)

48
Q

refers to a bundle of extremely thin and cylindrically shaped glass fibers surrounded by a concentric layer of glass coating that can conduct modulated light transmissions

A

fiber optic cable

49
Q

parts of the fiber optics cable

A

core
cladding
coating
strengthening fibers
cable jacket (sheath)

50
Q

refers to the innermost section that consists of one (1) or more very thin strands or fibers made of glass or plastic

A

core

51
Q

refers to an outer optical glass or plastic coating that surrounds and traps the light in the core by the principle of total internal reflection

A

cladding

52
Q

made from plastic that helps to shield the core and cladding from damage

A

coating

53
Q

stand as protection for the core against compressive forces or crushing and tension or excessive pulling.

A

strengthening fibers

54
Q

refers to an outermost layer that protects a buffer or a bundle of buffer- coated fibers against moisture, abrasion, crushing, and other environmental dangers.

A

cable jacket (sheath)

55
Q

mode of fiber optic cable that allows light waves to travel along a single path or in only one mode. It is used for high-speed transmission over long distances. Multimode fiber optic cable: This fiber optic cable type allows light waves to travel

A

single-mode fiber optic cable

56
Q

mode of fiber optic cable that allows light waves to travel into numerous paths through the core of the fiber at various angles. It is often applied to local area networks which encompass a much smaller transmission range

A

multimode fiber optic cable

57
Q

refers to a wireless medium that is used for multicast communications (e. g. radio and TV ever long broadcasting, wireless local loop, mobile communications, and amateur radio) and paging systems distances

A

radio wave

58
Q

also known as aerial, refers to a metallic structure that acts as a transducer that converts electrical energy to electromagnetic energy (upon transmission of signal) and vice-versa

A

antenna

59
Q

types of wave propagation

A

line of sight propagation method
ground wave (surface) propagation method
skywave (ionospheric) propagation method
space wave (tropospheric) propagation method

60
Q

a method by which radio waves travel from the transmitting antenna to the receiving antenna

A

line of sight propagation method

61
Q

a method by which radio waves are radiated directly towards the earth’s surface.

A

ground wave (surface) propagation method

62
Q

a method by which radio waves radiate upwards from the transmitting antenna of the earth into a direction towards the ionosphere

A

skywave (ionospheric) propagation method

63
Q

method by which radio waves radiation exceeds 30 мна up to 300 GH

A

space wave (tropospheric) propagation method

64
Q

to uled for sound/television broadcasting for ratio relay systems and for various mobile intein that operate at a frequency that ranges from 30 to 300 50, 300 AHz to 3 GHz, and 3 to G

A

space wave (tropospheric) propagation method

65
Q

used for long distance radiotelephony and sound broadcasting with a frequency that ringes from 3 MH to 30 MH

A

skywave

66
Q

refers to a wireless medium that is used for short-range communication (e. gremate control devices Intruder alarms, infra-red photography, and radiant heaters) in a closed area using line-of-sight propagation

A

infrared

67
Q

refers to a wireless medium that is used for unicast communication such as wireless PAN (Bluetooth), broadband wireless access or wireless MAN (WIMAX), wireless WAN (2G/3G cellular networks). satellite networks and radar, and wireless LANS (Wi-Fi).

A

microwave

68
Q

short-range wireless communication technology that allows devices such as mobile phones computers, and peripherals to transmit data or voice wirelessly over a short distance

A

bluetooth

net tech (6 decks)

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