Which of the following statements about Cisco ISE Guest and Web Authentication Services central web authentication are true?

A. It applies exclusively to wireless clients.

B. It applies to all Guest portals.

C. It applies only to Credentialed Guest portals.

D. It applies exclusively to wired clients.

Explanation:
Cisco Identity Services Engine (ISE) Guest and Web Authentication Services central web authentication applies to all Guest portals regardless of whether the portal requires the guest user to supply user name and password credentials. Central web authentication works by redirecting guest users to a browser-based portal on a central Cisco ISE Remote Authentication Dial-In User Service (RADIUS) server. This portal could be either a Credentialed Guest portal, where a guest is required to enter a user name and password, or a Hotspot Guest portal, where the guest is required to enter a hotspot code. The type of portal the guest is presented with depends on the configuration.

Cisco ISE local web authentication applies only to Credentialed Guest portals. Like central web authentication, local web authentication enables guests to authenticate to a network by using Cisco ISE. However, local web authentication does not use a central Cisco ISE RADIUS server. When a guest connects to a network access device (NAD), such as a switch, the device redirects the guest to an authentication webpage, or Credentialed Guest portal, in a browser. The guest user must then supply a user name and password to authenticate.

Cisco ISE local web authentication can apply to both wired clients and wireless clients. A wired client is typically redirected to a Credentialed Guest portal by first connecting to a switch port. A wireless client is typically redirected to a Credentialed Guest portal by first connecting to a Cisco Wireless LAN Controller (WLC). Cisco ISE central web authentication can also apply to both wired clients and wireless clients.

Reference: https://www.cisco.com/c/en/us/td/docs/security/ise/2-4/admin_guide/b_ISE_admin_guide_24/m_ise_guest.html#ID1314