問77
頻出度★★★
無線 LAN に関する記述のうち, 適切なものはどれか。
令和元年度 秋期 ITパスポート試験 問77
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 77
- ア
正解 The correct answer is ア. Because a wireless LAN communicates via radio waves, any third party within range of the access point's signal can attempt to connect. Therefore, measures such as authentication and encryption to prevent unauthorized use of the access point are essential. While a wireless LAN needs no cabling and is convenient, it also carries risks such as interception, spoofing, and freeloading, so it is an 'appropriate' statement in that security measures become necessary.
Incorrectイ
Incorrect. The encryption standards for wireless LAN are not limited to only WPA2. Multiple standards exist and are actually used, including the older WEP and WPA and the newer WPA3. The statement that it is 'limited to WPA2' does not match the facts.
Incorrectウ
Incorrect. Because a wireless LAN uses radio waves, the farther apart the terminal and the access point are, the weaker the signal becomes, and beyond a certain range communication is no longer possible. 'Communication is possible regardless of distance' does not hold.
Incorrectエ
Incorrect. Wireless LAN has multiple standards such as IEEE 802.11a/b/g/n/ac, and because the frequency bands used (such as the 2.4 GHz band and 5 GHz band) and methods differ, devices with different standards may be unable to communicate with each other. 'All of them can communicate with each other' is wrong.
ここがポイント
- A wireless LAN can be intercepted or misused by third parties within signal range, so security measures based on authentication and encryption are essential.
- There are multiple wireless LAN encryption standards (WEP/WPA/WPA2/WPA3) and communication standards (the IEEE 802.11 series), and they may be incompatible when the standard or frequency band differs.
用語