問46
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データセンタなどの施設において, 複数の機器類の保守性や設置効率を高めるために使用するものはどれか。
平成24年度 春期 ITパスポート試験 問46
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This question's explanation and your answers so far.
解説
問 46
- ア
正解 The correct answer is ア, Server rack. A server rack is a dedicated frame (enclosure) for housing servers, network devices, and similar equipment in stacked layers, and it is used in data centers and server rooms to install equipment in an orderly way. Most racks are standardized products with 19-inch (about 48 cm) mounting rails; equipment height is counted in units of 1U (about 4.45 cm), and a single rack can hold several dozen U of equipment stacked vertically. This makes it possible to install many devices at high density in the same floor area (better installation efficiency), and adding or replacing equipment only requires sliding it in or out along the rails. Cables can also be gathered into the cable routes inside the rack, so they do not get tangled and it is easy to trace which cable belongs to which device. Work can be done by opening the front and rear doors, and some products come with power strips, cooling fans, casters, and earthquake-resistant fixing brackets, so inspection, parts replacement, and other maintenance work can be carried out safely and in a short time (better maintainability). In other words, the thing that houses multiple pieces of equipment together and improves both maintainability and installation efficiency is the server rack, so ア is correct.
Incorrectイ
A hub (concentrator) is a network device that gathers LAN cables in one place and interconnects multiple devices. What it provides is a communication relay function; it has no role in physically housing equipment or increasing the number of units installed per unit of floor area. A hub is itself a device that gets mounted in a rack, not a facility for improving maintainability or installation efficiency.
Incorrectウ
A firewall is a security device (or software) placed at boundaries such as the one between an internal company network and the Internet; it permits or blocks the packets passing through it according to defined conditions, thereby protecting the inside from unauthorized access. Its purpose is to ensure security by controlling communication, and it has nothing to do with housing multiple devices or with installation efficiency.
Incorrectエ
A router is a network device that connects different networks and forwards packets while selecting a route based on the destination IP address. What it handles is the communication function of relaying between networks, not a facility that installs equipment together and makes it easier to maintain. A router, too, is merely one of the devices mounted in a server rack.
ここがポイント
- A server rack is a facility for housing equipment: following the standard of 19-inch width and 1U (about 4.45 cm) height units, servers and network devices are stacked in layers, achieving high-density installation (installation efficiency) together with tidy cabling and access from the front and rear (maintainability). Remember it as a data center facility term.
- Tell whether the question is asking about a function or a facility: hubs, firewalls, and routers are all devices that provide networking or security functions, and they are on the side that gets mounted in a rack. What supports the installation and maintenance of the equipment itself is facilities such as racks and power equipment.