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Public/Private Clouds

Deciding Which Cloud is Right for You

Cloud computing is changing the landscape of business technology. However, it is not just the technology that shapes the requirements for what your cloud operating model will look like. Organizations need to understand the benefits and risks of a move to the cloud in areas such as:

  • Strategic Drivers: time to market for new products, IT demand variations, impact of IT costs on business growth
  • Service Drivers: efficiency, security, reliability, flexibility, management reporting
  • Governance: maturity of processes, maturity of operating model procedures, security policies and guidelines for data and applications
  • Technology Landscape: maturity of IT environment, number of business users, geographic distribution of user base
  • Cost: transparency of costs for applications and infrastructure, cost allocation to your business users
  • Ease of Migration: last investment in significant capital expenditure, ratio of IT staff to business users, contractual or vendor commitments that constrain migration

In the transition to the Cloud, an end-to-end operating model must be reviewed carefully. This should not be a technology-led activity alone, but should also define the new roles and responsibilities that will be needed to operate this more agile, consumption-based model.


ENS-Inc cloud specialists partner with your organization to provide a complete overall solution that meets your organization’s changing and dynamic needs while still providing the necessary controls to mitigate risk.

Externally Outsourced Cloud Solutions

At their most basic form, cloud solutions are a way of taking an aspect of IT that traditionally has been housed within the physical walls of the business and then essentially outsourcing that aspect or service to an external provider… or to offer it up internally, but offered up abstracted in its most essential components.

Examples of externally outsourced cloud solutions would be a Public Cloud provider like's EC2 (Elastic Compute Cloud) Infrastructure as a Service (IaaS), a hosted application service like (Software as a Service - SaaS), or's PaaS, Platform as a Service, which offers up a standardized, hardened, and pre-built development environment for developers to quickly build massively scaling Internet Applications. All of these offerings are purchased on an as needed and subscription basis to release the need for purchasing capital expenditures of equipment that quickly become outdated and antiquated.

Some of these offerings are also available in smaller on premises models like Cloud Foundry, or VMware's vSphere (IaaS) product. This allows the business to retain physical control of the systems and data, yet also realize some of the benefits that cloud computing brings.

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Cloud Service Models

Infrastructure as a Service (IaaS)

IaaS offers the consumer a basic running operating system instance, usually as a virtual machine hosted on a hypervisor. Other infrastructure services are usually offered alongside the OS instance like VLANs, Load Balancers, Firewalls, Templated OS Instance Images to deploy from, etc. Connectivity to the service can be accomplished by utilizing the Internet or a dedicated WAN circuit. The consumer is then able to install their applications, databases, etc. and have complete control of everything inside of the operating system instance.

Platform as a Service (PaaS)

PaaS moves up the stack from Infrastructure as a Service (IaaS) by providing a development environment or "Platform" with a predefined set of programming languages, database, and application software. This allows the programmer to quickly create applications without having to configure and maintain the underlying development infrastructure, thus allowing a faster time to market for application development.

Software as a Service (SaaS)

SaaS moves up the stack from Infrastructure as a Service (IaaS) and Platform as a Service (PaaS). SaaS provides a specified application that can be customized to the unique needs of the customer. It allows the customer to get up and running quickly without the investment in obtaining, developing, and configuring the underlying infrastructure.

SaaS prevents the user from having any interaction within the Operating System (OS) or the development of the application.

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Cloud Delivery Models

There are four types of Cloud Delivery Models: Public, Private, Community, and Hybrid. These models define how the clouds are consumed and delivered to the consumer.

Public Clouds

In a public cloud, multiple businesses participate within the same cloud provider, usually with connectivity over the Internet or via dedicated WAN circuit. The typical example for this type of cloud delivery model would be Coke and Pepsi using the same cloud provider yet completely isolated from each other.

Private Clouds

Private Clouds are usually an internally built cloud within the "four walls" of the business utilizing one of the many Hypervisor vendors available. This provides some of the benefits of cloud computing, but the entire cloud is under the complete control of the business.

Community Clouds

Community Clouds are a spin-off of Public Clouds, but they usually focus on specific vertical market needs like Health Care, Finance, Government. They specialize their Cloud to cater to those market segments, offering services around the communities’ particular needs in areas like security, compliance, jurisdiction, etc.

Hybrid Clouds

Hybrid Clouds are a blending of at least two of the other delivery models (Public, Private, Community). This allows the consumer to have the best of all the different delivery models, and place workloads within the appropriate delivery model depending on needs for elasticity, burst-ability, security, compliance, and jurisdiction.


ENS-Inc cloud specialists partner with your organization to provide a complete overall solution that meets your organization’s changing and dynamic needs while still providing the necessary controls to mitigate risk.

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