問82
頻出度★☆☆
プラグアンドプレイに関する記述として, 適切なものはどれか。
平成27年度 春期 ITパスポート試験 問82
テクノロジ系コンピュータ構成要素 › 入出力デバイス
This question's explanation and your answers so far.
解説
問 82
- ア
正解 The correct answer is ア. Plug and Play means that when a peripheral device is connected to a PC, the OS automatically recognizes the device and automatically performs the installation of the necessary device driver and the setting of resources such as the interrupt request (IRQ) and I/O address, without any manual work by the user. As the name suggests, it means that you can plug it in and use it right away, and the fact that a USB device becomes usable simply by plugging it in is thanks to this function. Therefore, the description in ア, that when a peripheral device is connected to a PC the device driver is automatically installed and configured, is the appropriate explanation of Plug and Play.
Incorrectイ
Adding software later that enhances the functions of application software describes a plug-in (also called an add-in or add-on). It is a mechanism for adding functions to a browser or image editing software after the fact, and it is about extending the functions of software. This is a different concept from Plug and Play, which automatically recognizes and configures peripheral devices (hardware); it is a trap that merely has a similar name.
Incorrectウ
Supplying power from the PC to a peripheral device through the connecting cable describes bus power (USB bus-powered supply, PoE, and other power-supply methods). Being able to run a mouse or an external device with just one USB cable is thanks to this power-supply function, and it is about supplying electricity. Its purpose differs from that of Plug and Play, which refers to the automatic installation and configuration of drivers.
Incorrectエ
Executing a specific program and evaluating system performance based on the time taken for the processing describes a benchmark (benchmark test). It is a method of running a common measurement program and comparing the performance of devices numerically, and it is about performance evaluation. It has nothing at all to do with Plug and Play, which performs automatic configuration when a device is connected.
ここがポイント
- Plug and Play = a mechanism in which simply connecting a peripheral device makes the OS recognize it automatically and automatically install the device driver and set the resources. The keyword is plug it in and use it.
- Learn to distinguish the confusable related terms: plug-in (software that extends an application's functions later) / bus power (supplying power through the connecting cable) / benchmark (performance evaluation based on processing time).
用語