chapter one Flashcards
introduction
what is utility computing?
providing the software and hardware resources concentrated in large data centers, and users pay as they consume computing, storage, and communication resources.
how cloud computing is different from utility computing
cloud computing focuses on the business model for providing the services not only the system resources
utility computing requires a cloud-like …..
infrastructure
what is the motivation or the idea behind the cloud computing movement?
data processing can be done more efficiently on large farms of computing and storage systems accessible via the internet.
how the users are charged using cloud computing with an explaination?
As the resources for these services can be metered. the users can pay only for what they have used
explain: cloud computing offers elastic and scalable computing and storage services
as they can increase or decrease the resources according to the user’s needs OR the ability to dynamically
acquiring computing resources and supporting a variable workload and vice versa using internet technologies.
explain the presentation tier!
it is the topmost level of the application it basically runs on a computer or a laptop, it has a standard graphical user interface and displays information related to services.
explain the application/logic tier!
it controls the functionality of an application, it may consists of on or more separate modules running on a workstation or the application server, maybe multi-tiered itself!
explain the data tier!
it controls data on the database server, it runs a relational database management system on a database server. it improves scalability and performance and runs separately from other servers like the application server.
In the three-tier model, will modifying one tier will affect the other tiers? Can you provide an example?
any tier can be replaced independently. for example, a change in the operating system in the presentation tier will only affect the user interface code.
