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GCSE Computer Science > GCSE Computer Science - Networking > Flashcards

GCSE Computer Science - Networking Flashcards

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1
Q

What is interference?

A
  • Interference is when other devices such as cordless phones, microwave ovens, or any other devices that emit electro-magnetic signals interfere with the Wi-Fi transmission, causing a dropped connection.
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2
Q

What are the five main factors that affect network performance?

A
  • Bandwidth
  • Latency
  • Interference
  • Transmission Errors
  • Number of Devices Connected
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3
Q

What does LAN stand for?

A
  • Local Area Network
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4
Q

What are transmission errors?

A
  • Transmission errors are errors due to noise or distortion, meaning the data has to be retransmitted.
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5
Q

What does a modem do?

A
  • A modem enables the computer to be able to connect to the internet over a telephone line. A modem converts the digital signals that are sent by the computer to analogue signals that are then sent down the telephone line and vise-versa.
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6
Q

What is a full mesh network?

A
  • When all the devices on the network are connected to each other.
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7
Q

What are the two main topologies?

A
  • Star Network

- Mesh Network

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8
Q

What does WAN stand for?

A
  • Wide Area Network
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9
Q

What is the cloud?

A
  • The cloud refers to storing or saving data in an external storage system maintained by a third party, for example Microsoft. Instead of saving data on your device’s hard drive or local storage device, you save it to a remote storage facility, and access it via the internet.
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10
Q

What is a star network?

A
  • When all the devices on the network are connected to one central switch. This makes it look like a star if visualised.
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11
Q

What are the five main types of network hardware?

A
  • Router
  • Modem
  • Hub
  • Bridge
  • Switch
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12
Q

What is a topology?

A
  • A layout that connects computers together.
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13
Q

What does a switch do?

A
  • A switch performs a similar role to the hub and bridge but it is more powerful. It stores the MAC addresses of devices on a network and filters data packets to see which devices have asked for them, meaning that a switch is more efficient if demand is high.
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14
Q

What is latency?

A
  • Latency is the time delay between the moment that transmission of the first byte or packet of a communication starts, and when it is received at is destination.
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15
Q

What does a hub do?

A
  • A hub broadcasts data to all the devices on a network. This results in a lot of unnecessary data being sent which uses up a lot of bandwidth.
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16
Q

What are some advantages and disadvantages of the cloud?

A

Advantages:

  • You can access your data from anywhere in the world at any time.
  • You can share the data with other people in other locations around the world.
  • It is the responsibility of the provider to keep your data safe, therefore, backup is no longer an issue.

Disadvantages:

  • You are always dependant on having an internet connection in order to access or upload your data.
  • Some users are concerned by the security on the cloud, and whether their data and information can be accessed by hackers or data miners.
17
Q

What is bandwidth?

A
  • Bandwidth is the main factor affecting network performance. The higher the bandwidth, the faster the data is transferred.
18
Q

What does a bridge do?

A
  • A bridge connects two separate LAN networks. A computer can act as a bridge through the operating system. A bridge looks for the receiving data before it sends a message, meaning that it won’t send a message if the receiving computer isn’t there.
19
Q

What are the four layers in a TCP/IP model?

A
  • Application Layer
  • Transport Layer
  • Internet Layer
  • Link Layer
20
Q

What are the two main network models?

A
  • Client Server Network

- Peer to Peer Network

21
Q

What are the two main types of mesh networks?

A
  • Partial Mesh Network

- Full Mesh Network

22
Q

What is bandwidth measured in?

A
  • Bandwidth is measured in megabits per second. (Mbps)
23
Q

What does a router do?

A
  • A router connects devices within a building and forms a LAN.
24
Q

What is a partial mesh network?

A
  • When many devices on the network are connected together. A good example of this is the London Underground map.

GCSE Computer Science (1 decks)

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