問59
頻出度★★☆
クライアントサーバシステムにおいて，クライアント側には必要最低限の機能しかもたせず，サーバ側でアプリケーションソフトウェアやデータを集中管理するシステムはどれか。
平成25年度 春期 ITパスポート試験 問59
テクノロジ系システム構成要素 › システムの構成
This question's explanation and your answers so far.
解説
問 59
- ア
正解 The correct answer is ア, the thin client system. Thin means slim or lightweight: the client terminal is given only the minimum necessary functions such as screen display, input from a keyboard and mouse, and network communication, while running application software and storing and processing data are all done centrally on the server side. As a rule the terminal is not given an auxiliary storage device such as a hard disk, so business data does not remain inside the terminal, and the risk of information leakage from a lost, stolen, or removed terminal is greatly reduced. In addition, software installation and updates and virus protection can all be carried out together on the server side, so the more terminals an organization has, the more it can cut the effort of operational management and the TCO (total cost of ownership). The statement in the question, that the client side is given only the minimum necessary functions and that application software and data are centrally managed on the server side, matches this definition exactly, so ア is the correct answer. The opposite term is the fat client (rich client), which has enough processing power and storage on the client side and runs applications there.
Incorrectイ
An interactive processing system refers to a processing form in which the computer returns a response each time the user gives an instruction, so that the work proceeds through this back-and-forth exchange (operating an ATM, or the screen operations of online shopping, are typical examples). This is a classification of the processing form, that is, of how processing is carried on, not a classification of the system configuration, that is, of whether functions are placed on the client or on the server. Interactive processing takes place with a thin client system and with a fat client alike, so this term by itself explains neither keeping the client-side functions to a minimum nor centralized management on the server.
Incorrectウ
A batch processing system accumulates the data that arises over a certain period and processes it all at once at a fixed time or at a set cut-off point (payroll calculation, monthly closing, overnight batch runs, and so on). This too is a classification of the processing form, focused on when processing is executed, and it is the counterpart term to interactive processing. Its viewpoint differs from the configuration issue of keeping the client-side functions to the minimum necessary, so it does not match the description in the question.
Incorrectエ
In a peer-to-peer system, each participating computer stands on an equal footing (peer) and acts as both server and client, providing resources and services to the others. It places no central server; each device holds its own applications and data and does its own processing, a distributed configuration, so it is the exact opposite of centralized management on the server side. Moreover, the question presupposes a client-server system to begin with, and peer-to-peer is the configuration contrasted with the client-server type, so it also falls outside that premise.
ここがポイント
- Thin client: a scheme in which the terminal side has only the minimum necessary functions such as screen display and input and output, while running applications and storing data are managed centrally on the server side. Because no data is left on the terminal, it serves as a measure against information leakage, and software updates and maintenance can also be done together on the server side, which lowers operational management costs. The opposite term is the fat client (rich client), which does the processing on the client side.
- Telling apart terms that belong to different classification axes: interactive processing and batch processing are classifications of the processing form, of when and how processing is executed, while client-server and peer-to-peer are classifications of the system configuration, of how functions and roles are divided. When a question asks about the configuration, words that express a processing form drop out of the candidates. Peer-to-peer is a concept opposed to the client-server type in that its devices are equal peers and it does not presuppose a server that performs central management.
用語