Which WPA mode uses a pre-shared key (PSK) for authentication?

WPA/WPA2 Personal mode uses a pre-shared key (PSK) for authentication. This mode is suitable for small office/home office (SOHO) networks because it's simpler to set up, requiring only a passphrase to be configured on both the wireless access point and client devices. WPA/WPA2 Enterprise mode, on the other hand, uses 802.1X authentication with an external RADIUS server. This provides stronger security and centralized user management, making it ideal for larger organizations. "Local" and "Client" are not standard WPA authentication modes. "Local" might refer to local authentication databases on a device, but it's not a WPA mode. "Client" refers to the device connecting to the network, not an authentication mode itself.