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Which physical medium does that network commonly use?

  • A.A shielded twisted pair, which carries the high frequency signals required by the audio and video traffic
  • B.Coaxial cable
  • C.Optical fibre connecting each device in a ring, which gives immunity to interference and a very high bandwidth
  • D.A plastic optical fibre ring

Answer: D

Plastic optical fibre gives bandwidth and complete freedom from electrical interference. The last option describes exactly that arrangement, which makes it a correct and fuller statement. Copper versions of the standard also exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once.

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