Cloud Computing

Q.1 What is CaaS ?
Communication as a Service (CaaS), enables the consumer to utilize Enterprise level VoIP, VPNs, PBX and Unified Communications without the costly investment of purchasing, hosting and managing the infrastructure.
Q.2 Which cloud concept is related to pooling and sharing of resources ?
Applications run on physical systems that aren’t specified, data is stored in locations that are unknown, administration of systems is outsourced to others, and access by users is ubiquitous.
Q.3 What is the reliability of a system with n redundant components and a reliability of r?
The reliability of a system with n redundant components and a reliability of r is 1-(1-r)n. Therefore, when a datacenter achieves a reliability of 99 percent, two redundant datacenters have a reliability of 99.99 percent (four nines) and three redundant datacenters can achieve a reliability of 99.9999 percent (six nines).
Q.4 Which dimension corresponds to two different states in the eight possible cloud forms?
The sourcing dimension addresses the deliverer of the service.
Q.5 What is hybrid cloud?
A hybrid cloud combines multiple clouds where those clouds retain their unique identities, but are bound together as a unit. A hybrid cloud may offer standardized or proprietary access to data and applications, as well as application portability.
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