問76
頻出度★★★
無線LANに関する記述として, 適切なものだけを全て挙げたものはどれか。 a ESSIDは, 設定する値が無線LANの規格ごとに固定値として決められており, 利用者が変更することはできない。 b 通信規格の中には, 使用する電波が電子レンジの電波と干渉して, 通信に影響が出る可能性のあるものがある。 c テザリング機能で用いる通信方式の一つとして, 使用されている。
平成27年度 秋期 ITパスポート試験 問76
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 76
Incorrectア
“ア” lists only a, but a is wrong. The ESSID (SSID) is a name that identifies a wireless LAN network, and users or administrators can freely set and change it. It is not fixed for each standard, so “ア”, which includes a, is inappropriate.
Incorrectイ
“イ” lists a and b; although b is correct, a is wrong (users can change the ESSID). Because it includes the wrong statement a, “イ” is inappropriate.
- ウ
正解 The correct answer is “ウ (b, c)”. The question asks you to select all and only the correct statements about wireless LAN. Statement b is correct: wireless LAN standards that use the 2.4GHz band (such as IEEE 802.11b/g/n) use the same 2.4GHz band (the ISM band) as microwave ovens, so their radio waves can interfere and affect communication. Statement c is also correct: tethering is a function that lets other devices connect to the internet through a smartphone or similar device, and its communication methods include wireless LAN (Wi-Fi), USB, and Bluetooth, so wireless LAN is used as one of them. Statement a, on the other hand, is wrong. Therefore the correct statements are the two, b and c, and “ウ”, which lists exactly these with nothing missing or extra, is the correct answer.
Incorrectエ
“エ” lists only c; although c is correct, statement b, which is also correct, is missing. The question asks you to list “all” correct statements, so “エ”, which lacks b, is incomplete and inappropriate.
ここがポイント
- The ESSID (SSID) is a name that identifies a wireless LAN access point, and users and administrators can freely set and change it; it is not a value fixed for each standard.
- The 2.4GHz-band wireless LAN (IEEE 802.11b/g/n) uses the same ISM band as microwave ovens and the like, so interference can occur. Also, the communication methods for tethering include wireless LAN, USB, and Bluetooth.
用語