問54
頻出度★★☆
サーバの仮想化に関する記述として, 適切なものはどれか。
平成23年度 秋期 ITパスポート試験 問54
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 54
Incorrectア
This describes virtual reality (VR). What the computer creates is a virtual world that a person experiences (a simulated experience of images, sound, and so on); it does not create multiple computers themselves. It has nothing to do with server consolidation.
Incorrectイ
This describes a technology for remotely operating another computer over a network from the terminal at hand (commonly called remote desktop). The computer being operated is a single one that already exists, and no new computers are created, so it is not a description of server virtualization.
- ウ
正解 Server virtualization is a technology that uses software to create multiple independent computers (virtual machines) on a single physical server (a physical computer), so that each one can run its own OS and applications. Choice ウ, “A technology that virtually realizes multiple computers on a single computer”, is exactly this definition, so it is the correct answer. Because multiple virtual servers can be consolidated onto one physical server, you gain benefits such as fewer servers, savings in installation space and power consumption, better utilization of resources such as CPU and memory, and easier configuration changes. Several choices contain the word “virtual”, but the deciding point is whether what is created virtually is “a whole computer itself”. Only ウ meets that condition.
Incorrectエ
This describes virtual memory. It uses part of the auxiliary storage device in place of main storage so that a memory area larger than the actual main memory capacity appears to be available; only the memory space is virtualized. It does not create multiple whole computers.
ここがポイント
- Server virtualization = a technology that realizes multiple virtual machines on a single physical computer. Its purpose is to reduce the number of servers, the installation space, and the power consumption through server consolidation, and to make effective use of resources such as CPU and memory.
- Distinguish other technologies that are easily confused with virtualization: virtual reality (VR) creates a world for a person to experience, remote desktop operates a remote computer, and virtual memory uses the auxiliary storage device to make the memory space look larger than the main storage device. Tell them apart by asking “what exactly is being created virtually”.
用語