Anyone within radio range can receive wireless frames, so a WLAN (wireless LAN) must authenticate who joins and encrypt what they send. The Wi-Fi Alliance certifies security generations called WPA (Wi-Fi Protected Access). The original WEP (Wired Equivalent Privacy) and first-generation WPA with TKIP (Temporal Key Integrity Protocol) are broken and obsolete. The CCNA focuses on WPA2 and WPA3, each in Personal and Enterprise modes, and on who does what during 802.1X authentication.
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