An overlay network is a telecommunications network that runs independently on top of another
one, although supported by its infrastructure.
Examples of overlay networks include cloud provider
networks, peer-to-peer (P2P) networks, virtual
private networks (VPNs),
content delivery networks (CDNs), experimental
networks, and voice over IP (VoIP) services such as
Most overlay networks run on top of the public Internet, which itself
began as an overlay research network running over the infrastructure of the public switched
telephone network (PSTN).
This was last updated in March 2013
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