Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ICT > Chapter_4_(Digital_communication) > Flashcards

Chapter_4_(Digital_communication) Flashcards

1
Q

What does the speed at which devices can transfer data depend on?

A

It depends on the bandwidth of the connection.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is bandwidth?

A

The number of bits that can be carried by the connection in one second.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does higher bandwidth mean?

A

Higher bandwidth means more data can be transferred every second, making download and uploads faster.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is buffer?

A

An area of memory used to temporarily store data, especially in video streaming.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What happen if the buffer is empty when playing a video?

A

There will no more videos to play and it will pause until more data is downloaded.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How to avoid the buffer becoming empty?

A

Data must be downloaded into the buffer constantly, filling it up at a rate faster than it is emptied.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How can you identify the latency?

A

By pinging a domain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is latency?

A

The amount of time it takes to send data between devices.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is domain?

A

The name used to identify the web server.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Wireless method has to work on an unlimited amount of frequency.

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which carry more frequencies, copper cable or wireless method?

A

Copper cables

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What interfere with wired and wireless signals?

A

Other electromagnetic signals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How can cabled connection be done to prevent interference?

A

They can be shielded.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What reduce the available bandwidth of wireless signals?

A

Walls and furniture reduce the strength of wireless signals.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What reduce the strength of wired and wireless signals?

A

The more distance reduce the strength of wired or wireless signals.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is LAN?

A

LAN is a network that connects digital devices that are in a small geographical area.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is WAN?

A

WAN is a network that is spread over a large geographical area.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What does WANs use?

A

It often use connectivity provided by a third party telecommunications company, often linking LANs together through the internet.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

WANs have _____ transfer speeds than LANs.

A

Slower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is PAN and WPAN?

A

PANs is a group of connected devices that are all near an individual user.

WPAN (Wireless Personal Area Network)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is tethering?

A

Tethering is connecting a host device that uses a mobile broadband connection with other devices, so that they can use the host’s broadband connection.

22
Q

What are some common methods that digital devices use to share data?

A
  • Satellite
  • Broadcast
  • Wired
  • Wireless
23
Q

What does digital devices use to receive radio signals that satellites transmit?

A

Antenna

24
Q

What are the benefits and disadvantage of satellite communication?

A
  • It has number of satellites meaning the system is always available and can’t be affected by power shortages
  • Satellite signals does not pass through solid objects meaning they might not be available in some places
25
Q

Which communication does GPS use?

A

Satellite communication

26
Q

From where do GPS signals send from and how many satellites is required to calculate the accurate location of digital device?

A

GPS signals are sent from a network of 24 satellites orbiting the earth and only four is required to calculate the accurate location.

27
Q

What is DVB?

A

Digital video broadcasting is the internationally accepted standard method of broadcasting digital television.

28
Q

What is DVB-S?

A

Digital video broadcasting satellite is a type of DVB which a video signals from broadcaster is transmitted using a large antenna on earth to one or more satellites which thenbroadcasted signals back to earth, received by antenna.

29
Q

What decodes the signals received from satellite and send it to television?

A

set-top box

30
Q

What are other things that satellite communication allows?

A

It is used for people in remote areas to place voice calls using satellite telephones.

31
Q

What broadcast television and radio signals that are received by viewer’s antenna?

A

Transmitter

32
Q

What is DVB-T?

A

Digital video broadcasting (terrestrial) is a method of DVB where transmitters are based on earth, rather than in orbit as they are in DVB-S.

33
Q

What is DVB-T2?

A

DVB-T2 is a newer standard that provides more functionality, such as HDTV and interactive services.

34
Q

What is DAB?

A

Digital Audio Broadcasting which is broadcast in the same way as DVB, and it provides more radio stations and can also carry text data that DAB receivers can display.

35
Q

What is ethernet?

A

A network connectivity standard that provides a way for computers to communicate.

36
Q

What are the connection types and their uses?

A
  • HDMI - digital video connections
  • S/PDIF - Digital audio connections
  • Minijack - Personal headphones
  • USB - Storage transfer
  • Ethernet - networking
37
Q

What does ethernets allow?

A

It allow user to connect to wired networkers?

38
Q

What is the maximum length of ethernet cable which can carry signals without lose of quality?

A

100meters

39
Q

What is WI-FI?

A

Wi-Fi is a wireless technology used to connect devices to a network which are connected to the internet.

40
Q

Which specification of standards does Wi-Fi for wireless communications?

A

IEEE 802.11

41
Q

What is Bluetooth?

A

Bluetooth is a type of wireless connectivity that lets devices connect over short distance.

42
Q

Which can carry more data Wi-Fi or Bluetooth?

A

Wi-Fi

43
Q

What is Bluetooth used?

A

It is used to transfer small files between devices.

44
Q

What are difference between Wi-Fi and bluetooth?

A
  • Wi-Fi has long range
  • Wi-Fi has higher bandwidth
  • Wi-Fi has higher power consumption
  • Wi-FI has higher security
  • Wi-Fi can connection multiple simultaneously while Bluetooth is limited
45
Q

What are 3G and 4G used?

A

They are used to provide internet access to mobile devices.

46
Q

What does G in 3G and 4G stands for?

A

Generation

47
Q

What does Infra-red transmitters should have?

A

It must have a clear line of sight to receivers because this allows signal to travel in a straight line between them?

48
Q

What does NFC (near field communication) use?

A

It use close proximity RFID chips.

49
Q

What are the advantages and disadvantages of Wired and wireless connectivity?

A

Wired

  • Cables are cheap for small number
  • Risk of tripping over cables
  • Faster than wireless
  • Less affected by interference than wireless
  • Not portable and may need signal booster
  • Can look untidy
  • Most secure
  • Using cables and ports long time may damage them

Wireless

  • may need wireless access point
  • Slower than wired
  • Affected by obstacles
  • Portable within signal range
  • Tidy
  • Less secured
50
Q

What is ISP?

A

A company that provides customers with access to the internet. (internet service provider)

51
Q

What does ISP use?

A

Fibre optic cable or copper cable network

52
Q

What does mobile broadband provide?

A

High-speed wireless connectivity using 3G or 4G

ICT (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions