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Andrea Finardi Iot simulations with Cisco Packet TracerBog'liq 2.3 (3)2.2.3 Cloud Deployment Models
Deployment models are foundation of the NIST definition and describes ownership, size
and who can access the cloud infrastructure. Four models are included in the definition:
private cloud, public cloud, community cloud and hybrid cloud.
Private cloud is an infrastructure owned and at disposal of one single organization. Cloud
itself can be hosted either on-premises or hosted on third party facility. Private compa-
nies might use private clouds to centralize IT environments or to extend the on-premises
service to cloud solutions running on third party companies. In this scenario the cloud
consumer is also cloud provider, in-house IT department can assume a specific role of
providers. Additionally, as long as IT resources are remotely accessible, they can be
consider as cloud resources. Private clouds have a significant physical footprint and usu-
ally require capital investments.
Public cloud is a widely accessible cloud environment owned and hosted by a third party
company, that assumes the role of cloud provider. This is usually at disposal of general
public and is most likely free of charge.
Security concerns are raised when utilizing public clouds as data are hosted “outside the
premises” and, as service is provided for a broad audience, is most like accessed over
non-trusted networks.
Community cloud deployment model is similar to the public cloud concept, however ac-
cess is limited to a specific set of organization that have common needs. Underneath
infrastructure can be either owner by a third party company or co-owned by the member
of the community. Usually access for parties outside the community is denied.
Hybrid cloud is the last deployment model on the NIST definition and usually refers to a
combination of other deployment models. Due to criticality of the data some organization,
for example, could outsource some services over public cloud and maintain others within
the own private cloud. Hybrid clouds present the unique challenge to avoid disparity in
the cloud environments if managed by different providers.
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