令和8年度 ITパスポート試験問59

This question's explanation and your answers so far.

問59

頻出度★★★

無線 LAN で使用する WPA2の機能として, 適切なものはどれか。

出典　令和8年度 ITパスポート試験問59

解説

問 59

Incorrectア
Speeding up transmission and reception by using two antennas describes technologies that raise communication speed, such as MIMO (multiplexing with multiple antennas); this is a speed-boosting feature of wireless LAN standards (IEEE 802.11n and later). It has nothing to do with WPA2, which is a security function.
Incorrectイ
Making the access point stealth describes SSID stealth, in which the SSID (network name) is not broadcast. This is a different security measure that hides the access point so it is harder to connect to; it is not the data-encryption function of WPA2.
ウ
正解 WPA2 (Wi-Fi Protected Access 2) is a security standard that protects wireless LAN communication, and its core function is encrypting communication data. WPA2 uses a strong encryption method called AES (CCMP) to encrypt the data flying through the air as radio waves, preventing third parties from eavesdropping on or decoding it. Therefore, choice ウ, encrypting communication data, is the appropriate function of WPA2.
Incorrectエ
Rejecting access from devices other than those with registered MAC addresses describes MAC address filtering. This is an access-control method that limits which terminals can connect; it is a different measure from WPA2, which encrypts the communication content.

ここがポイント

WPA2 is a wireless LAN security standard whose core function is to encrypt communication data with AES (CCMP) to prevent eavesdropping.
Wireless LAN security measures come in several types, such as encryption (WPA2), SSID stealth, and MAC address filtering; the key point is not to confuse their purposes.

用語

解答問59ウ