INTERVIEW QUESTION:

What is Infrastructure as a Service?


The term Infrastructure as a Service, or IaaS (also, occasionally called Hardware as a Service), falls within the subject area of Cloud Computing and is sometimes accompanied by the terms Platform as a Service (PaaS) and Software as a Service (SaaS).  


Infrastructure as a Service describes a model where organizations outsource hardware requirements such as database storage, networking components, servers, and database/server virtualization to an outside vendor . The organization will often pay on a per-use basis meaning the vendor charges based on actual storage space used in conjunction with data transmission rates.   The vendor provides the equipment and is responsible for its maintenance which typically offers dynamic scalability as the purchasing organization’s hardware requirements increase.  

Infrastructure as a Service means the companies can focus on creating applications without incurring the upfront costs of purchasing and maintaining underutilized hardware.

The following diagram shows a simplified view of the 3 main layers of cloud computing and how each layer builds upon the one which precedes it.  

 


Image Reference: http://venturebeat.com/2011/11/14/cloud-iaas-paas-saas/

posted @ Sunday, November 11, 2012 8:13 PM by Chris Adams