What protocols are commonly used in Cisco ISE for authentication?

The correct choice highlights the significance of RADIUS (Remote Authentication Dial-In User Service) and TACACS+ (Terminal Access Controller Access-Control System Plus) as the primary protocols used in Cisco Identity Services Engine (ISE) for authentication purposes.

RADIUS is widely used for enabling centralized authentication, authorization, and accounting for users who connect and use a network service. It operates over UDP and is well-suited for environments where user authentication is required to access network services.

TACACS+ is a more secure option that operates over TCP, providing similar functionalities to RADIUS but offering additional features such as encrypting the entire body of the packet, making it suitable for higher security needs. It separates the authentication, authorization, and accounting processes, allowing for finer control and management.

These protocols are vital for Cisco ISE as they provide the necessary framework for secure access control and are integral to managing user identities and their corresponding permissions in a network environment. Using them ensures that only authorized users can access resources, thereby enhancing overall network security.