問5
頻出度★☆☆
業務で利用される IT 関連サービスに関する記述 a～c と, サービス名称の適切な組合せはどれか。 a 自社のサーバや通信機器を専門業者の施設内に預けて使用する。 b 専門業者の通信設備やサーバの一部を利用者が利用できる。 c ソフトウェアの必要な機能だけを必要時に, 利用者がネットワーク経由で利用できる。
平成23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
Incorrectア
It is wrong in taking a as SaaS and c as a colocation service. Item a is about placing the company's own servers and communication equipment with a provider, which is a matter of where hardware is installed, not SaaS, where software functions are used over a network. And c says that only the necessary functions of software are used, so it cannot be a colocation service, which lends out space for installing equipment. Only b-Hosting is correct here; a and c have been swapped.
- イ
正解 The correct answer is “イ” (a-Colocation service (housing), b-Hosting service, c-SaaS). Two points decide it: who owns the equipment, and what the user is renting. In a, the company brings its own servers and communication equipment into a specialized provider's data center and leaves them there, so what it rents is the installation space (rack, power, air conditioning, and network lines); this is a colocation service (housing). In b, the user rents and uses part of the communication equipment or servers owned by the specialized provider, and the equipment belongs to the provider, so it is a hosting service (a rental server). In c, the software itself is not purchased or installed; only the necessary functions are used over a network when they are needed, which is exactly the definition of SaaS (Software as a Service). Applying these three in order gives a-Colocation, b-Hosting, c-SaaS, which matches the row “イ” of the combination table.
Incorrectウ
a-Colocation is correct, but b and c have been swapped. Item b says that the user can use part of a specialized provider's communication equipment or servers, and what is lent out is hardware resources, so it is a hosting service, not SaaS, which provides software functions. Conversely, c says that only the necessary functions of software are used over a network when needed, so it cannot be explained by a hosting service that lends out servers.
Incorrectエ
c-SaaS is correct, but a and b have been swapped. This is the typical wrong answer that mixes up colocation and hosting: placing your own equipment in a provider's facility, as in a, is colocation (housing), while renting and using the provider's equipment, as in b, is hosting. Tell them apart by whether the owner of the equipment is your own company or the provider.
ここがポイント
- A colocation service (housing) is the form in which a company places equipment it owns in a provider's facility (a data center) and rents the installation space, power, air conditioning, and network lines. A hosting service is the form in which the user rents and uses part of the servers or communication equipment that the provider owns. Tell them apart by whether the owner of the equipment is your own company or the provider.
- SaaS is the form in which software is not purchased or installed, and only the necessary functions are used as a service over a network when they are needed. Colocation and hosting provide something on the hardware side, whereas SaaS provides the application layer — that is the difference.
用語