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Three of the following typically incur a data transfer charge. Which is the odd one out?

  • A.traffic leaving out to the internet
  • B.traffic between two availability zones
  • C.traffic between two separate regions
  • D.traffic between two instances in one subnet

Answer: D

Correct answer: traffic between two instances in one subnet

Traffic within a single subnet stays inside one availability zone and is normally free. The other three all cross a boundary that is metered: out to the internet, between availability zones, and between regions, with the charge rising in that order. Knowing where those boundaries lie is most of what cloud network cost control amounts to.

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