Most of us are familiar with the paradigm of “cloud computing, fog computing, edge computing” originally developed by firms such as Cisco. In that topology, cloud computing happens remotely, at some distant end of a wide area network. Fog computing happens closer to the end points, but on some more-centralized server, possibly someplace in a metro network.
Edge computing might further include processing on a device or on a server located on the same premises as the devices. That might be phrased “device edge, premises edge or metro edge.” Multi-access edge computing or infrastructure edge computing provide examples.
As hyperscale cloud computing giants move into the edge computing space, some additional notions arise. Though the notion of “cloud computing” (far end of a wide area network) still holds, there is a newer concept, where many of the same functions typically performed at a cloud data center happen locally: on a premises or within a metro area, perhaps.
The Amazon Web Services Wavelength service illustrates the metro computing example. AWS Outposts is an example of premises-based functions normally supplied at an AWS cloud data center.
Some might call that “edge cloud.”
source: TechTarget
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