問22
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ハウジングサービスを利用することによって得られる効果として, 最も適切なものはどれか。
平成22年度 春期 ITパスポート試験 問22
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 22
Incorrectア
Reducing the costs related to the use, introduction, and updating of business applications is the effect of using an ASP or SaaS, in which the provider supplies the application software itself over the network. With colocation, what is rented from the provider is only the place to put the equipment and the lines; the users themselves procure the business applications to run on the server and carry out their introduction and version upgrades, so those costs do not go down.
Incorrectイ
Reducing even the purchase cost of servers is the effect of a hosting service (a rental server). With hosting, users rent and use servers owned by the provider, so they do not need to buy the equipment, and the operational workload such as dealing with hardware failures is also borne by the provider. In contrast, the servers placed in a colocation facility are owned by the users, so both the purchase cost and the operation of the equipment remain their burden. Only the part about network-related costs going down applies here, but because the reduction of server purchase costs and of operational workload does not hold, this is not the most appropriate choice.
Incorrectウ
Avoiding the update work for the OS and office software itself is the effect of using SaaS or an ASP, where the provider maintains the software, or of desktop virtualization (thin clients), where software management is consolidated on the server side. With colocation, maintenance work such as applying patches to the OS and middleware of the servers you have placed there remains within the responsibility of the users, and update work on computers located inside the company has nothing at all to do with placing equipment in a data center.
- エ
正解 The correct answer is エ. A colocation service (housing) is a form of service in which users bring servers and communication equipment that they themselves have purchased and own into a data center operated by a provider and are allowed to install them there. What the provider supplies is the installation space itself: an earthquake-resistant building and racks, uninterruptible power supplies and on-site generators, dedicated air conditioning, security such as entry and exit control, 24-hour monitoring, and high-speed, redundant lines to the Internet. Purchasing the server hardware, and operating and managing the OS and applications that run on it, remain on the user side. The effect obtained is therefore that the costs of facilities such as a server room, and of high-capacity communication lines, which the company would otherwise have to prepare by itself in order to keep providing services with its own servers, can be reduced by sharing the provider facilities. エ, which states exactly this, is the most appropriate.
ここがポイント
- Tell colocation (housing) and hosting apart by asking who owns the server. In colocation, equipment owned by the user is installed in the provider facility and what is rented is the space, power, air conditioning, security, and lines, so what goes down is facility costs and line costs. In hosting, servers owned by the provider are rented, so server purchase costs and the operational workload for the equipment go down as well.
- Ways of using external services can be organized as layers of how much you leave to the provider: renting only the facility = colocation (housing), renting the server as well = hosting, renting the business application as well = ASP or SaaS. Once you judge which layer of costs the effect given in a choice acts on, you can pick the correct answer.
用語