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Fundamental
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Hybrid Cloud Combining Local Data With Azure Scale
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A healthcare organization maintains a legacy database containing sensitive patient records that must remain hosted within its local on-premises datacenter to comply with strict regional data sovereignty regulations.
At the same time, the organization wants to build a new public-facing appointment booking web application in Azure to benefit from high availability, automatic scaling, and a pay-as-you-use billing structure, while securely connecting back to the on-premises records.
Which cloud deployment model best satisfies the organization's requirements?
Explanations
Hybrid cloud
Hybrid cloud
What the Hybrid Cloud Model Is
A hybrid cloud is a computing environment that combines an on-premises private cloud (or local datacenter) with a public cloud (such as Microsoft Azure), allowing data and applications to be shared between them through secure network connections.
How It Meets the Requirements
- Regulatory compliance and data sovereignty: The organization can keep highly sensitive patient medical records on-premises within local infrastructure (using technologies like Azure Stack Hub or dedicated local servers) to fulfill legal mandates.
- Scalability and cloud elasticity: The public-facing web portal can run directly in the Azure public cloud, utilizing elastic computing and pay-as-you-use consumption billing to accommodate fluctuating traffic.
- Interoperability: Hybrid connectivity enables secure, encrypted communication between the public-facing application and the local database.
Key Advantages
- Flexibility: Enables organizations to run workloads where they make the most architectural and legal sense.
- Cost efficiency: Allows organizations to leverage operational expense (OpEx) models in the public cloud while preserving existing capital investments (CapEx) on-premises.
- Gradual modernization: Supports legacy applications that cannot easily migrate to the public cloud immediately.
- Security and control: Gives full administrative control over highly sensitive assets while tapping into cloud scale.
Why This Is Optimal
The hybrid cloud model delivers the exact balance needed: local hosting to guarantee strict compliance and public cloud hosting to achieve rapid scalability and cost optimization.
Private cloud
Private cloud
What the Private Cloud Model Is
A private cloud consists of computing resources used exclusively by a single business or organization. It can be physically located at the organization's on-premises datacenter or hosted by a third-party service provider on dedicated hardware.
Why It Doesn't Meet the Requirement
Using exclusively a private cloud ensures compliance for the patient database, but it fails to provide the benefits of Azure public cloud elasticity, global reach, and cloud-native pay-as-you-use economics for the patient booking portal. Hosting everything privately would require purchasing and managing additional on-premises hardware (CapEx) to handle web traffic peaks.
Key Characteristics and Limitations
- Single-tenant environment: Hardware and infrastructure are dedicated solely to one organization.
- High upfront costs: Requires significant capital investment in physical servers, networking, and maintenance.
- Limited rapid scaling: Scaling requires purchasing and installing additional physical hardware.
This Answer Would Be Correct If
The organization required all systems and services to reside entirely within their own private datacenter without any integration with public cloud services.
Community cloud
Community cloud
What a Community Cloud Is
A community cloud is a shared cloud infrastructure provisioned for exclusive use by a specific community of consumers from organizations that have shared concerns, missions, security requirements, or compliance policies (such as government agencies or healthcare consortia).
Why It Doesn't Meet the Requirement
A community cloud does not address the scenario where an individual enterprise maintains its own on-premises infrastructure while extending specific customer-facing workloads into Azure. The scenario specifically involves combining proprietary local on-premises infrastructure with Microsoft Azure public cloud services.
Key Characteristics and Limitations
- Shared multi-organization infrastructure: Managed and utilized by a consortium of organizations with identical needs.
- Higher complexity: Involves shared governance and cost-sharing models among multiple independent entities.
- Not focused on hybrid integration: Does not inherently describe combining private enterprise datacenters with public cloud platforms.
This Answer Would Be Correct If
Multiple distinct healthcare organizations jointly created and funded a shared computing platform to collaborate on industry-wide research under a unified regulatory framework.
Public cloud
Public cloud
What the Public Cloud Model Is
A public cloud is a cloud computing deployment where computing, storage, and networking resources are entirely owned, operated, and maintained by a third-party cloud service provider (such as Microsoft Azure) and delivered over the internet to multiple tenants.
Why It Doesn't Meet the Requirement
While a public cloud model excels at hosting the scalable booking application and offering pay-as-you-use pricing, moving the entire workload—including the sensitive patient database—to the public cloud violates the organization's requirement to keep data hosted locally on-premises for regulatory compliance and data sovereignty.
Key Characteristics and Limitations
- Multi-tenancy: Infrastructure is shared securely across multiple organizations.
- Off-premises infrastructure: All hardware resides exclusively in the provider's global datacenters.
- Compliance challenges: Some strict local regulations prohibit storing specific categories of data in external datacenters.
This Answer Would Be Correct If
The organization had approval to host all patient data and web services entirely in public Azure regions without requiring on-premises datacenter hosting.
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