問50
頻出度★★★
建物の中など, 限定された範囲内を対象に構築する通信ネットワークはどれか。
平成27年度 春期 ITパスポート試験 問50
テクノロジ系ネットワーク › ネットワーク方式
This question's explanation and your answers so far.
解説
問 50
Incorrectア
IP-VPN is a WAN-type service that uses a closed IP network provided by a telecom carrier to link the LANs of distant sites as if they were virtual leased lines. What it covers is wide-area connection between sites, not the inside of a building, so it is not a network built within a limited area.
- イ
正解 A LAN (Local Area Network) is a communication network built to cover a limited area, such as a single building or a single site. A typical case is connecting PCs, printers, and servers on an office floor or inside a school building using switches and wireless access points; the area it covers is one where the cabling can be laid and managed by the organization itself. The condition in the question, a limited area such as inside a building, matches choice イ, LAN.
Incorrectウ
A WAN (Wide Area Network) is a large-scale network that links LANs located in geographically distant areas over carrier lines. It is the counterpart concept to a LAN, and it is the exact opposite of the condition of a limited area.
Incorrectエ
Wide-area Ethernet is a WAN service that uses Ethernet technology over a carrier network to connect the LANs of several sites so that they behave like a single LAN. The word Ethernet makes it easy to associate it with a LAN, but the area it covers is between sites (wide area), not the inside of a building.
ここがポイント
- The basic idea is to contrast them by the area they cover: a LAN is a network for a limited area such as inside a building or on one site, while a WAN is a wide-area network that links the LANs of distant sites over carrier lines.
- Note that both IP-VPN and wide-area Ethernet are WAN-type services provided by telecom carriers (the former routes over an IP network, the latter connects site LANs using Ethernet technology); they are not other ways of saying LAN.
用語