問99
頻出度★★☆
1台の物理的なコンピュータ上で,複数の仮想サーバを同時に動作させることによって得られる効果に関する記述a～cのうち,適切なものだけを全て挙げたものはどれか。 a 仮想サーバ上で,それぞれ異なるバージョンのOSを動作させることができ,物理的なコンピュータのリソースを有効活用できる。 b 仮想サーバの数だけ,物理的なコンピュータを増やしたときと同じ処理能力を得られる。 c 物理的なコンピュータがもつHDDの容量と同じ容量のデータを,全ての仮想サーバで同時に記録できる。
令和4年度 ITパスポート試験 問99
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 99
- ア
正解 In virtualization, the CPU and memory of a single physical computer are divided so that multiple virtual servers (virtual machines) can run at the same time. Each virtual server can load its own independent OS, so as description a states, each can run a different version of the OS and make effective use of the physical computer resources; this is a representative effect of virtualization. Only description a is appropriate, so option ア, which lists only a, is the correct answer.
Incorrectイ
Description a is correct, but including c makes this option wrong. Description c claims that all virtual servers can record data of the same capacity as the physical HDD at the same time, yet storage capacity is shared from one physical disk, so the total is capped at the physical capacity and this does not hold.
Incorrectウ
This option treats only b as appropriate, but that is wrong. Virtual servers merely share the CPU and other resources of one physical computer, so they cannot obtain the same processing capacity as adding physical computers equal to the number of servers. The overall processing capacity is capped by the performance of the physical hardware.
Incorrectエ
This option treats only c as appropriate, but that is wrong. All virtual servers cannot record data of the same capacity as the physical HDD at the same time; the description that is actually appropriate is a.
ここがポイント
- Virtualization (server virtualization) runs multiple virtual servers on a single physical computer, and each can load a different OS, so resources are used effectively.
- Virtualization is a technology that divides and shares hardware, so it cannot provide processing capacity or storage capacity that exceeds the total physical resources such as CPU performance and HDD capacity.
用語