loud computing’s first wave began with server
centralization and virtualization—resulting in a
paradigm shift that changed how data is stored
and how software is used. The emerging second
wave,
software-defined networking
(SDN), takes network
centralization and virtualization, and especially network
control, into the cloud.
After emerging in datacenters, SDN deployment has
grown up into the networking-as-a-service (NaaS) model
cloud service providers now offer to enterprise and residen
-
tial subscribers. By centralizing control-plane software (the
software controlling the part of the network that carries the
signaling traffic responsible for routing) to the controller
and its applications, and controlling the device data plane
(the actual data-packet movement) remotely, devices can
become simpler. Thus, SDN significantly reduces the ad
-
ministrators required and as a result reduces expenses,
both capital and operational. SDN also enables fast service
orchestration because the data plane is highly program
-
mable from the remote control plane at controllers and
applications. In general, SDN takes networking into the
computing domain and will increasingly adopt the stan
-
dardization practices common for computing and software
loud computing’s first wave began with servercentralization and virtualization—resulting in aparadigm shift that changed how data is storedand how software is used. The emerging secondwave,software-defined networking(SDN), takes networkcentralization and virtualization, and especially networkcontrol, into the cloud.After emerging in datacenters, SDN deployment hasgrown up into the networking-as-a-service (NaaS) modelcloud service providers now offer to enterprise and residen-tial subscribers. By centralizing control-plane software (thesoftware controlling the part of the network that carries thesignaling traffic responsible for routing) to the controllerand its applications, and controlling the device data plane(the actual data-packet movement) remotely, devices canbecome simpler. Thus, SDN significantly reduces the ad-ministrators required and as a result reduces expenses,both capital and operational. SDN also enables fast serviceorchestration because the data plane is highly program-mable from the remote control plane at controllers andapplications. In general, SDN takes networking into thecomputing domain and will increasingly adopt the stan-dardization practices common for computing and software
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