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Questions and Answers
What is one of the primary risks associated with multi-tenancy in an outsourced private cloud?
How do security measures differ between an on-site private cloud and an outsourced private cloud?
Which of the following is NOT a typical start-up cost for subscribing to an outsourced private cloud?
What is a significant limitation of on-demand bulk data import/export in outsourced private clouds?
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When considering an outsourced private cloud, what does a subscriber typically need to adjust regarding their network?
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What is a critical factor affecting the performance of real-time or critical processing in outsourced private clouds?
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Which aspect is often included in a service level agreement (SLA) for an outsourced private cloud?
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What is a characteristic of an outsourced private cloud regarding resource provisioning?
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Which characteristic of public cloud allows for flexibility in workload management?
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What is a primary advantage of using a private cloud for organizations?
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How are subscribers typically connected to an on-site private cloud?
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What major risk is associated with data security in public cloud services?
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Which of the following best describes the concept of 'elasticity' in public cloud services?
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Which factor is essential to consider in service level agreements (SLAs) for cloud services?
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What is a potential drawback of shared resources in a public cloud environment?
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Which of the following is true regarding the operation of public cloud infrastructure?
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What is a characteristic of public cloud service level agreements?
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Which of the following is an advantage of using a private cloud?
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Which scenario illustrates an outsourced private cloud?
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What is a key management consideration for on-site private clouds?
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Which security concern is associated with public clouds?
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How are workloads managed in a private cloud environment?
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What is a major disadvantage of public cloud service level agreements?
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What defines an on-site private cloud?
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Study Notes
Cloud Computing - Deployment Models
- There are four main deployment models for cloud computing:
- Public Cloud
- Private Cloud
- Hybrid Cloud
- Community Cloud
Public Cloud
- Cloud infrastructure is available for public use
- Owned, managed, and operated by a business, academic, or government organization
- Located on the premises of the cloud provider
- Examples: Google App Engine, Microsoft Windows Azure, IBM Smart Cloud, Amazon EC2
- Provider’s computing and storage resources are shared by multiple subscribers
- A subscriber's workload may be co-resident with the workloads of competitors or adversaries
Risks of Public Cloud
- Limited Visibility and Control: Provider system operation details are proprietary and not divulged to subscribers. Subscribers cannot verify data deletion from provider systems.
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Data Security:
- Provider's software is usually proprietary and not open to review.
- Data may be relocated to data centers where cost is low.
- Security Risks: Public cloud introduces risks to both reliability and security.
- Network Dependency: Subscribers connect to providers via the public Internet, relying on Internet's infrastructure like DNS servers, router infrastructure, and inter-router links.
- Elasticity: The public cloud provides an illusion of unlimited resource availability, and the provider may migrate a subscriber's workload at any time.
Private Cloud
- Cloud infrastructure is provisioned for exclusive use by a single organization.
- It can be owned, managed, and operated by the organization, a third party, or a combination of both.
- Examples: Eucalyptus, Ubuntu Enterprise Cloud - UEC, Amazon VPC (Virtual Private Cloud), VMware Cloud Infrastructure Suite, Microsoft ECI data center.
Types of Private Cloud
- On-site Private Cloud: Private clouds implemented at a customer's premises.
- Outsourced Private Cloud: Private clouds where the server side is outsourced to a hosting company.
On-site Private Cloud
- The security perimeter extends around both the subscriber's on-site and the private cloud's resources.
- The subscriber can exercise control over the resources.
- Organizations considering an on-site private cloud should consider:
- Network Dependency: Subscribers still require IT skills to manage user devices and cloud infrastructure.
- Workload Locations: Workloads must be able to migrate between machines without inconveniencing clients.
Outsourced Private Cloud
- The security of data and processing depends on the strength and availability of both the security perimeter and the protected communication link.
- Organizations considering the use of an outsourced private cloud:
- Subscribers may provision unique protected and reliable communication links.
- On-demand bulk data import/export is limited by network capacity.
- Real-time or critical processing may be problematic because of networking limitations.
- A variety of techniques exist to harden the security perimeter.
Costs of Outsourced Private Cloud
- Modest-to-significant up-front costs to migrate to the cloud.
- Main start-up costs for the subscriber relate to:
- Negotiating service level agreements (SLA).
- Upgrading subscriber's network to connect to the outsourced private cloud.
- Switching from traditional applications to cloud-hosted applications.
- Porting existing non-cloud operations to the cloud.
- Training.
- A subscriber can rent resources in any quantity offered by the provider.
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Description
Explore the four main deployment models of cloud computing: Public, Private, Hybrid, and Community Cloud. This quiz covers the definitions, characteristics, and risks associated with public cloud usage. Test your knowledge on how these models operate and their implications for data security.
