Explanation
Two authentication methods that would be used with a guest portal are social login and external portal. So the correct answers are A. social login and B. external portal.

Explanation
According to Wikipedia1, 802.1X is an IEEE Standard for port-based network access control (PNAC). It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN using Extensible Authentication Protocol (EAP) over wired IEEE 802 networks and over 802.11 wireless networks, which is known as "EAP over LAN" or EAPOL.
The authentication process involves three parties: a supplicant (the client device), an authenticator (the network device such as an access point), and an authentication server (typically a RADIUS server). The supplicant must provide valid credentials to the authenticator before it can access the network resources.
The credentials are exchanged with a RADIUS server prior to the 4-way Handshake because the 4-way Handshake is used to establish encryption keys between the supplicant and authenticator after successful authentication2. The credentials are exchanged with a RADIUS server after the 802.11 Association because the 802.11 Association is used to establish a logical link between the supplicant and authenticator before authentication can take place3.

Explanation
In the IEEE 802.1X authentication process, the AP acts as an authenticator.

Explanation
Mist Radio Resource Management (RRM) performs several functions including transmit power control and channel assignment which help optimize wireless network performance by dynamically adjusting radio settings based on changing environmental conditions.So,the correct answers are A.transmit power control and C.channel assignment

Explanation
An extended service set (ESS) is a set of two or more basic service sets (BSSs) that form a single subnetwork.
Each BSS within the ESS has its own unique BSSID and the SSID is common across all BSSs within the ESS.
So the correct answers are B. Each BSS within the ESS has its own unique BSSID and C. The SSID is common across all BSSs within the ESS.