問5
頻出度★☆☆
自社で利用する購買システムの導入に当たり, 外部サービスであるSaaSを利用した事例はどれか。
平成27年度 秋期 ITパスポート試験 問5
ストラテジ系システム戦略 › ソリューションビジネス
This question's explanation and your answers so far.
解説
問 5
- ア
正解 SaaS (Software as a Service) is a delivery model in which the user, via the internet, uses only the functions they need from business application software prepared by the service provider. Choice ア says “from the procurement business application, use only the functions the company wants to use, via the internet”, and because it receives the application layer itself as a service, it is exactly an example of SaaS. The distinctive point is that the company does not build or own the system itself; it only uses finished business software.
Incorrectイ
Here the company rents the “foundation (platform) that runs applications” — server, OS, and general-purpose database — and builds its own procurement system on top of it. This is an example of PaaS (Platform as a Service), which provides an application development and execution environment, not SaaS, which uses a finished application.
Incorrectウ
Here the company builds its own procurement system on the “server (hardware / infrastructure)” provided by the service provider. A model where you rent only the infrastructure and place your own system on it is IaaS (Infrastructure as a Service), not SaaS.
Incorrectエ
Here the company places a server it owns in the provider's facility (data center) and uses it — this is a colocation (housing) service. The equipment is owned by the company, and the provider supplies neither software nor infrastructure, so it is not SaaS.
ここがポイント
- Cloud services are distinguished by the scope of what is provided: SaaS = using a finished business application, PaaS = using the application development and execution foundation (server / OS / database), IaaS = using infrastructure such as servers. The higher the layer, the smaller the user's management burden.
- Colocation (housing) merely places the company's own equipment in the provider's facility, renting neither software nor infrastructure, so it is a different thing from the above three cloud categories.
用語