問56
頻出度★★★
LANに関する記述①～③のうち, 適切なものだけを全て挙げたものはどれか。 ① LANに, テレビやゲーム機を接続することもできる。 ② LANの構築には, 電気通信事業者との契約が必要である。 ③ LANを構成する機器間の接続には, ケーブルや無線が用いられる。
平成26年度 秋期 ITパスポート試験 問56
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 56
Incorrectア
① is correct, but ② (building a LAN requires a contract with a telecommunications carrier) is not. A LAN can be built simply by installing your own cables, routers and access points on your own premises, so no contract with a carrier is needed. This option is also wrong because it leaves out ③, which is correct.
Incorrectイ
This option treats ①, ② and ③ all as correct, but ② is wrong. A contract with a carrier is needed for a WAN that links sites in separate locations, or when using an internet connection service (an internet service provider or a line contract); it is not a condition for building a LAN itself.
- ウ
正解 The correct answer is ウ (①, ③). A LAN (Local Area Network) is a network that connects devices to one another within a limited site or building, such as a home, an office, or a school. As ① says, it is not only PCs that can be connected to a LAN: network-capable TVs, game consoles, printers, smartphones and the like can be connected too, and this is a common way of using a home LAN. As ③ says, the devices can be connected either by wired LAN using LAN cables or by wireless LAN (Wi-Fi) using radio waves, and both methods are used. Therefore only ① and ③ are correct, and ウ, which lists exactly these two with nothing missing or added, is the correct answer.
Incorrectエ
③ is correct, but this option is wrong twice over: it includes ②, which is incorrect, and it excludes ①, which is correct. Network-capable devices such as TVs and game consoles can also be connected to a LAN, so ① is a correct statement.
ここがポイント
- A LAN is a network you build yourself within limited premises (a home, an office, a school, etc.), and it needs no contract with a telecommunications carrier. Keep the distinction clear: a contract is required when you use a WAN or an external internet connection service.
- It is not only PCs that can be connected to a LAN, but any network-capable device such as TVs, game consoles, printers and smart home appliances; and there are two connection methods, wired (LAN cable) and wireless (wireless LAN / Wi-Fi).
用語