Discussion
Which of the following computer networks is built on the top of another network?
Answer: D
Correct answer: overlay network
An overlay network is built as a logical topology on top of an existing physical one: its links are paths, possibly many hops long, through the underlying network. Peer-to-peer systems, VPNs and content distribution networks are all overlays. The advantage is that new services can be deployed without changing the infrastructure beneath; the cost is that the overlay cannot see the real topology and may route inefficiently across it.
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