Communications hardware Flashcards

1
Q

Hubs

A
  • connects any computers together
  • broadcast input signal from one port to all other ports on the hub
  • if there’s lots of traffic then the network packets will collide slowing down the network speed
  • used to make a star network
  • each computer needs its own cable directly to the hub
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2
Q

Switch

A
  • advanced form of network hub
  • when message arrives, it transmits it to the destination device
  • by switching the connection between ports, devices can make use of the full bandwidth without collisions
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3
Q

Router

A
  • will forward data packets between different computer networks
  • reads the final destination address of the packet and then sets it to a router that is closer to the destination
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4
Q

Modem

A
  • Modulator Demodulator - device which modulates a computer’s digital signal into an analogue signal for transmission over an existing telephone line
  • allows computers to connect to networks over long distance using the existing telephone networks
  • dial-up modems operate at transmission speeds of about 60 kilo bits per second (very slow)
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5
Q

Wireless access point

A
  • uses wi-fi to connect
  • cables don’t need to be laid, but does have security risks
  • encryption can prevent outside users from reading the data packets
  • wireless networks tends to be slower than wired ones
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