Discussion
Which one of the following computer network is built on the top of another network?
Answer: D
Correct answer: overlay network
An overlay network is a logical network constructed on top of another, its links being paths through the underlying network rather than physical connections. Peer-to-peer file sharing systems, virtual private networks and content distribution networks are the common examples. It permits new services without any change to the infrastructure, at the cost of routing decisions made in ignorance of the real topology below.
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