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Year 9 > Computer Science - Networks 🔌 > Flashcards

Computer Science - Networks 🔌 Flashcards

1
Q

What IS a network?

A

A network is two or more computers that are linked together so that they are able to share resources.

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2
Q

What are some examples of resources that networks allow to share?

A

Resources networks allow to share could be a printer, scanner, software or even a connection to the Internet.

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3
Q

What is the advantage of being able to share physical devices through a network?

A

Buying many peripheral devices such as printers can be very expensive. A network allows a lot of money to be saved by letting a single printer be shared among the computers connected to the network.

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4
Q

What is the advantage of being able to share digital software through a network?

A

Having to buy individual copies of a software for each computer in a workspace is far more expensive than buying one network copy to share among the workspace.

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5
Q

How does a network help to back up work?

A

With a network, work from any computer can be backed up centrally.

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6
Q

How does a network help people access data?

A

Using a network, people from any workstation can access the same data. It allows work to be more collaborative.

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7
Q

How does a network help to assign security?

A

Network security can be assigned centrally.

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8
Q

What is the viral disadvantage of using a network?

A

Viruses can be spread more easily by a network. If one virus enters a computer, it can spread throughout the network to all workstation.

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9
Q

What is the security disadvantage of using a network?

A

Hackers can gain access to the network. If the hacker gets access to the network, they have access to all the files.

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10
Q

How can a network be unstable? How does this cause problems?

A

The network can break down, and if it breaks down, users will not have access to the important information held within.

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11
Q

How can a network be expensive?

A

Although a networks can save a lot of money by saving purchases of expensive peripherals, the initial cost of buying a server, cables, and other network equipment can be very expensive.

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12
Q

What are the TWO main types of network?

A

LAN and WAN.

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13
Q

What does “LAN” stand for?

A

Local Area Network.

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14
Q

What does “WAN” stand for?

A

Wide Area Network.

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15
Q

What is the range of a Local Area Network?

A

A LAN is usually confined to a small area, usually a single building.

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16
Q

What is the range of a Wide Area Network?

A

A WAN covers a wide geographical area, often between cities, countries, and even continents.

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17
Q

How are devices connected in a Local Area Network?

A

Cable, wireless, infrared, and microwave links which are usually owned by the organization.

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18
Q

How are devices connected in a Wide Area Network?

A

More expensive telecommunication links that are supplied by the telecommunication companies, such as satellite links.

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19
Q

What type of network is more expensive? WANs or LANs?

A

LANs are less expensive to build as equipment is owned by the organization which is cheaper than renting lines and equipment, WANs are more expensive to build as sophisticated communication systems are used involving rental of communication lines.

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20
Q

What are the MAJOR computer network components and devices?

A
  • Network Interface Card (NIC)
  • Hub
  • Switches
  • Router
  • Modem
  • Cables and connectors
  • Software
  • Servers
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21
Q

What is a network interface card?

A

A stand-alone NIC is used in a desktop computer, a Network adapter or NIC is a device which allows a computer to communicate with other computers/networks.

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22
Q

What are the two forms of NIC?

A

Wired and wireless.

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23
Q

What is a wired NIC?

A

A wired NIC employs cables and connectors as a medium to transfer data. It can only connect to a network through wires.

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24
Q

What is a wireless NIC?

A

In a wireless NIC, the connection is made using an antenna that uses radio wave technology. It can connect to a network wirelessly.

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25
Q

What is a network hub?

A

A Network hub is a network component that divides a network connection like a central dissemination center for multiple devices. When a computer request information from a network or a particular computer, it transmits the request to the hub through a cable. The hub receives the request and broadcasts it to the ENTIRE network.

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26
Q

What have network hubs been replaced with in the modern day?

A

In the modern day, hubs are almost obsolete and superseded by more advanced network communication equipment such as Switches and Routers.

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27
Q

What is the main disadvantage of a network hub that led to it being replaced by other equipment?

A

Network hubs do not know how to send information to a specific workstation. It can only broadcast all network data across each connection.

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28
Q

What is a network switch?

A

A network switch is like a smart Hub made with advanced features like the ability to form tables that keep updated about all the computers or devices and on which switch port it is on. Using the physical device addresses in each incoming messages, it delivers the message to the correct destination or port, not every machine.

29
Q

How does a network switch transmit data to a single destination?

A

Before transmitting, it analyses which system or port should the message be transmitted to. The switch connects the source and destination directly which increases the speed of the network.

30
Q

What is a network router?

A

A Router is the network component that is employed to connect a LAN to an internet connection. It routes data between different networks.

31
Q

What is a network modem?

A

An modem allows connection to the internet over the existing telephone line. A modem is not required for LAN, but needed for internet connection via dial-up and DSL. It converts digital data to analog and vice versa.

32
Q

What is a broadband network modem?

A

A broadband modem is utilized to yield a high speed Internet connection provided by an ISP (Internet Service Provider). The high speed connection can be DSL (Digital Subscriber Line) from a telephone company or cable (cable modem) from a cable television provider.

33
Q

What is a cellular modem?

A

Cellular modem is employed when the cellular data mobile network (3G and above) is used to access the internet, usually provided by cellular mobile operators.

34
Q

What is a fiber broadband modem?

A

Fiber Broadband Modem is used to achieve even higher speed connection, in the Gigabits range to the internet via optical fiber network.

35
Q

What is the name given to the controlling computer that runs a network?

A

A server.

36
Q

About how long should a secure password be?

A

8 characters.

37
Q

What should a secure password include?

A

Numbers, capital letters, simple letters, and symbols.

38
Q

What are access rights?

A

When different users are allowed to access different kinds of files in a network.

39
Q

What are the different kinds of cables in a network?

A
  1. Twisted pair cable
  2. Coaxial cable
  3. Fiber optic cable
40
Q

What is a Twisted pair cable?

A

Twisted pair cables consist of four pairs of copper wires. The individual pairs have two wires that are separately insulated in plastic, then twisted around each other and bound together in a layer of plastic. They transmit data in the form of electricity.

41
Q

Where are twisted pair cables used?

A

In telephone lines, used within a building for LAN supporting personal computers.

42
Q

What are the advantages of twisted pair cables?

A

They are cheap, easy to install, and widely available & widely used.

43
Q

What are the disadvantages of twisted pair cables?

A

The data transmission speed is slow, it can only be used to connect computers in a limited distance, and is vulnerable to distortions. Therefore, there is a high error rate.

44
Q

What can lead to distortion of data in twisted pair cables?

A

High temperature, or sound.

45
Q

What is a coaxial cable?

A

A wire with two conductors.. One is a single wire in the center of the cable, and the other is a wire mesh shield that surrounds the first wire, with an insulator in between. There is a plastic jacket around that.

46
Q

What is a coaxial cable used to transmit?

A

Voice, video, and data.

47
Q

Where are coaxial cables used?

A

In home video equipment, television cable, and long distance telephone.

48
Q

What are the advantages of coaxial cables?

A

They are less vulnerable to interference than other types of copper medium, and can carry more data than twisted cables.

49
Q

What are the disadvantages of coaxial cables?

A

They are more expensive, and damage to the cable can bring down the whole network.

50
Q

What is a fiber-optic cable?

A

It is made of tiny transparent strands of glass fiber, they transmit data in the form of light. One bundle carries data in one direction and another bundle carries data in the opposite direction.

51
Q

What are the advantages of fiber-optic cables?

A

It enables large volumes of digital data to be transmitted, is VERY fast, not affected by distortions, can obtain high security, and is used over greater distance.

52
Q

What are the disadvantages of fiber-optic cables?

A

It is very expensive and difficult to terminate (an average person cannot disassemble it because it is harmful)

53
Q

What are the different forms of wireless media?

A
  1. WI-FI
  2. Bluetooth
  3. 3G and 4G
  4. Infra-Red (IR)
  5. Near-field communication (NFC)
54
Q

What is WI-FI?

A

A wireless local area network that uses radio waves to connect computers and other devices to the Internet.

55
Q

What does WI-FI stand for?

A

Wireless Fidelity

56
Q

Where is WI-FI used?

A

WI-FI is used in home and office networks.

57
Q

Who provides WI-FI access in towns and cities?

A

Some companies provide WI-FI access in towns and cities.

58
Q

What is Bluetooth?

A

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

59
Q

What is required before Bluetooth devices are communicated?

A

Bluetooth devices need to be paired with each other before they can communicate.

60
Q

What is Bluetooth used for?

A

Bluetooth can be used to transfer small files between devices. It is used to connect devices such as smart phones and laptops to peripherals such as portable speakers, headphones, earphones, keyboards and mice.

61
Q

Compared to WI-FI, how much data can Bluetooth carry?

A

NOT AS MUCH!!!

62
Q

What is 3G and 4G and 5G?

A

3G and 4G and 5G are sometimes referred to as mobile broadband. They are used to provide internet access to mobile devices such as smartphones and tablet devices when a WI-FI signal is not available.

63
Q

What does the “G” stand for in 3G?

A

It stands for “Generation”, meaning that 3G is the third generation of mobile technology.

64
Q

What is Infra-Red?

A

A type of wireless signal that cannot carry as much data and have a short range. The signal is affected by sunlight as a recognizable beam of light is sent.

65
Q

Where is Infra-Red used?

A

It is often used in remote control devices such as television remote controls.

66
Q

What are NFCs?

A

A type of wireless media that uses close proximity RFID (Radio Frequency Identification) chips.

67
Q

What does NFC stand for?

A

Near-field communication

68
Q

Where are NFCs used?

A

NFC is used in smartphones, payment cards and travel cards.

69
Q

What is the item of information which uniquely identifies the ISP to the home network?

A

The IP address.

Year 9 (23 decks)

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