Page 650 - Cloud computing: From paradigm to operation

3 XaaS

1 Scope
This Recommendation provides functional requirements and use cases of Infrastructure as a Service (IaaS),
one of the representative cloud service categories. This Recommendation covers the following:
– General description of IaaS;
– Functional requirements of IaaS;
– Typical IaaS use cases.
NOTE – The general requirements of IaaS can be found in [ITU-T Y.3501].

2 References

The following ITU-T Recommendations and other references contain provisions which, through reference in
this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated
were valid. All Recommendations and other references are subject to revision; users of this Recommendation
are therefore encouraged to investigate the possibility of applying the most recent edition of the
Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is
regularly published. The reference to a document within this Recommendation does not give it, as a stand-
alone document, the status of a Recommendation.

[ITU-T X.1601] Recommendation ITU-T X.1601 (2014), Security framework for cloud computing.
[ITU-T Y.3500] Recommendation ITU-T Y.3500 (2014), Information technology – Cloud computing –
Overview and vocabulary.
[ITU-T Y.3501] Recommendation ITU-T Y.3501 (2013), Cloud computing framework and high-level
requirements.
[ITU-T Y.3502] Recommendation ITU-T Y.3502 (2014), Information technology – Cloud computing –
Reference architecture.

[ITU-T Y.3510] Recommendation ITU-T Y.3510 (2013), Cloud computing infrastructure requirements.

3 Definitions

3.1 Terms defined elsewhere
This Recommendation uses the following terms defined elsewhere:

3.1.1 cloud capabilities type [ITU-T Y.3500]: Classification of the functionality provided by a cloud service
to the cloud service customer, based on resource used.
NOTE – The cloud capabilities types are application capabilities type, infrastructure capabilities type and platform
capabilities type.
3.1.2 cloud computing [ITU-T Y.3500]: Paradigm for enabling network access to a scalable and elastic pool
of shareable physical or virtual resources with self-service provisioning and administration on-demand.
NOTE – Examples of resources include servers, operating systems, networks, software, applications, and storage
equipment.
3.1.3 cloud service [ITU-T Y.3500]: One or more capabilities offered via cloud computing invoked using a
defined interface.
3.1.4 cloud service category [ITU-T Y.3500]: Group of cloud services that possess some common set of
qualities.
NOTE – A cloud service category can include capabilities from one or more cloud capabilities types.
3.1.5 cloud service customer [ITU-T Y.3500]: Party which is in a business relationship for the purpose of
using cloud services.

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