問86
頻出度★★☆
サーバの仮想化技術に関する記述として, 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86
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 86
- ア
正解 The correct answer is ア. Server virtualization is a technology that uses virtualization software to logically divide the resources of one physical computer (a physical server) — its CPU, memory, disk, and so on — and run several virtual servers (virtual machines) on it at the same time. Each virtual machine has its own independent OS and applications, so to users they look like separate servers. Because the spare resources of a single physical server can be used without waste, the number of servers can be reduced, which cuts installation space, power, and operating costs. In addition, a virtual machine can be handled as a file, so adding one, copying one, or moving one to another physical server is also easy. Choice ア, which says “running multiple virtual servers on a single computer,” is exactly this definition.
Incorrectイ
Technology for safely using a public line such as the Internet as if it were the company's own dedicated line is the description of a VPN (Virtual Private Network). It is a line- and network-level technology that protects the content of communications by encryption and authentication, so it deals with a different subject from virtualization, which runs multiple servers on a single computer.
Incorrectウ
Technology for creating a realistic virtual space by using computer graphics and audio technology is the description of VR (Virtual Reality). It is a presentation technology that works on human sight and hearing, not a virtualization technology that divides and uses the computing resources of a server.
Incorrectエ
Technology that uses part of an auxiliary storage device such as a hard disk in place of main memory, so that a memory space larger than the physically installed memory can be used, is the description of virtual memory. It uses the same word “virtual,” but it is a memory management function of the OS, not a technology that makes a server itself appear as several servers.
ここがポイント
- Server virtualization = a technology for running multiple virtual servers (virtual machines) on one physical server. It makes effective use of the physical server's resources, reduces the number of servers, the installation space, the power, and the operating costs, and makes adding or relocating systems more flexible.
- The IT Passport exam tends to test the terms containing “virtual” as a set. Be ready to tell apart virtualization (running several servers on one machine), VPN (using a public line as if it were a dedicated line), VR (creating a realistic virtual space), and virtual memory (using a hard disk in place of main memory) by what each one makes appear as what.
用語