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OCR GCSE 2019 COMPUTER SCIENCE > Unit 1.4 - Wired And Wireless Networks > Flashcards

Unit 1.4 - Wired And Wireless Networks Flashcards

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1
Q

Stand-Alone Pc

A

Computer that is
not connected
to any other device, network or the internet.

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2
Q

A Network

A

Two or More Computers connected together

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3
Q

Advantages of - Network

A
  • Share Hardware (Printers) - - Share Files
  • Log on anywhere
  • Central Backups
  • Central Virus checks
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4
Q

Disadvantages of - Network

A
  • Viruses & Hackers
  • Network Failure & Traffic
  • Costs of Hardware &
    Software needed
  • Expert Knowledge & Skills
    needed
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5
Q

LAN

A

Local Area Network

Small geographical location

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6
Q

WAN

A

Wide Area Network

Large geographical location (Network of Networks)

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7
Q

A Switch

A

Links Computers and Peripherals in an LAN

Switch - Sends data only to device needed

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8
Q

A Hub

A

Links Computers and Peripherals in an LAN

Sends data to all devices

More Data Collisions, Slower Network, Cheaper, Security Risks

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9
Q

Network Interface Card (NIC)

A

Needed in Every Device / Peripheral to connect to a Network

MAC Address

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10
Q

Router

A

Receives, Forwards, Directs

data packets between Networks & Computer

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11
Q

Wireless Access Point

A

Links computers & peripherals Wirelessly

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12
Q

Modem

A

Modulator Demodulator

Converts analogue signals to digital and back again

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13
Q

Bridge

A

Connects two separate LAN Networks.

Relays data to receiving computer.

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14
Q

Server

A

Responds to request for data

Stores data used by other computers on a network

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15
Q

Ethernet

A

Twisted Pairs of Cables

Cat-5, Cat-5e, Cat-6

Cheap, Sturdy
 Short Distance (100m) & EMI/RFI Interference, Slower
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16
Q

Coaxial Cable

A

Insulated Central Wire

Braided wire shield to Prevent Interference

Cheap, Long Distances
EMI/RFI Interference

17
Q

Fibre Optics

A

Glass Threads
Transmit Light as Data

Fast Bandwidth (10 Ghz), Secure,
Long Distance, No Interference
Expensive, Brittle

18
Q

Client-Server Network

A

Client makes requests to the server for Data, Access & Programs.

19
Q

Peer-to-Peer Network

A

All Computers are Equal

Peers download/share different parts of the same file.

20
Q

Network/Wired Performance

A

Transmission Used (Fibre or Copper)

Number of Users

Bandwidth

Error Rate

Latency

21
Q

Wireless Performance

A

Frequency Range

Channels Used / Sharing Channels

Distance from WAP

Physical Obstacles (Thick Walls, Metal)

Non-Wifi Interference (Microwaves, Cordless Phones)

22
Q

Bandwidth

A

How much data can be transferred over a connection in a given time

23
Q

Latency

A

How much Delay in sending and receiving bits.

24
Q

Error Rate

A

How many data errors happen over a given time.

Sending a 0 instead of 1
Caused by Weak signals over longer distances
Or Electromagnetic / Radio Frequency Interference

25
Q

The Internet

A

World wide collection of computer networks

26
Q

DNS

A

A directory to match the URL (Domain Name)

with their IP address

27
Q

Hosting

A

Websites stored on Dedicated Web Servers

28
Q

The Cloud

A

Remote Web Servers used to store data and software accessed using a device on the internet.

29
Q

The Cloud - Advantages

A

Cost - Less Hardware

Cost - Less Technical staff

Automatic Backup

Access Anywhere, Anytime

Any Device, Any OS

Software auto updated

Easy Collaboration

30
Q

The Cloud - Disadvantages

A

Reliant to keep data Safe

Need Internet

Hackers & Attacks

Servers fail - No data

Business fails – data is lost

31
Q

Virtual Network

A

Software based network

Divide Devices on a LAN in smaller groups.

32
Q

VPN

A

Devices connecting remotely to a LAN using a secure connection ensuring data sent is Encrypted (Tunneling)

OCR GCSE 2019 COMPUTER SCIENCE (5 decks)

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