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All 5 Flashcards — Cloud services
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Question
What is cloud computing?
Answer
Renting computing from a provider over the internet instead of buying and running the machines yourself. You pay for what you use and the provider keeps the hardware working.
Question
What is the difference between IaaS, PaaS and SaaS?
Answer
How far up the stack the provider takes over. IaaS gives you a machine and you install the OS upwards. PaaS runs the OS and runtime, and you supply your program. SaaS is the finished program — you just sign in.
Question
When should an organisation choose IaaS?
Answer
When it needs to choose the operating system or its version — for software with unusual requirements — and has technical staff able to configure and maintain the machines.
Question
When should an organisation choose SaaS?
Answer
When it needs a finished tool and has no technical staff. The provider handles updates, patching and backups, and the service is usable immediately.
Question
What is the trade-off between control and convenience in cloud services?
Answer
Every layer you hand to the provider saves you work and removes a choice. Towards IaaS: more control, more responsibility for patching and setup. Towards SaaS: ready in minutes, but you accept the provider's features and versions and moving away later is hard.
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Full study notes for Cloud services
Topic 1.1 hub
Hardware and operation
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Computer Science exam skills
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