cloud computing service models

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CLOUD COMPUTING SERVICE MODELS
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• Cloud Computing Service Models
• Cloud computing is a convenient way of
  on-demand network access to shared pool of
  resources such as networks, storages, servers,
  applications, and services which can be instantly
  provisioned and released as per consumer
  requirement.
• Cloud Computing includes 3 service models
• IAAS (Infrastructure As A Service) Host
• PaaS (Platform As A Service) Build
• SaaS (Software As A Service) Consumer

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IAAS (Infrastructure As A Service) Host
In this service model, consumer acquires required
resources available in the Cloud infra and
chooses to deploy and managed the acquired
resources as per his/organization
requirement. Consumer will not have control over
the Cloud Infra but the applications alone which
he has acquired from cloud. This leads to
limitation with high availability as the acquired
resources needs to be managed and controlled as
and when there is any unexpected outages or
platforms updates at cloud infra level. PaaS
(Platform As A Service) Build In this
service model, Consumer will deploy his acquired
resources on to the cloud infra itself and let
cloud infra manage his acquired resources. By
this Consumer will not have control over cloud
infra as we all his acquired resources. This
model is highly available as the Cloud infra will
take ownership of providing alternate solution
due to unexpected outages.
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SaaS (Software As A Service) Consumer
In this service model, Consumers are provisioned
to utilize the available pre-defined
configuration resources as they are available in
the cloud infra without acquiring them.
The resources /applications are accessible
through various client devices. Consumer
will not have control over cloud infra nor on
resources. This type of model eliminates capital
expense of buying hardware or software as they
are set to run on on-site datacenters.
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• Windows Azure Virtual Private Network Models
• Windows azure vpn model are of 2 types
• Site to Site VPN
• Internal organization should have RRAS or
  physical gateway installed on one VM client. This
  will enable all clients in local site to access
  on clients/resources in cloud virtual network.
• Internal organization should also requires
  IPSec secured connection for encryption services.
  This also enables in Hardware based VPN on own
  organization.
• On Virtual network cloud we need to install
  Azure gateway on one of the VM client.
• 2. Point to Site virtual networks
• Specific vms or more than one VMs on the
  internal organization will be connecting to cloud
  based virtual network but not all VMs on the
  internal org.
• Hence this is not network to network
  connectivity as this is selective VMs
• Needs creation of Root certificate for point to
  point vpn set up.

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