Which of the following allows Cisco TrustSec a faster and more secure delivery of environment updates from Cisco ISE to the NADs?

The correct answer is the use of HTTPS servers with REST APIs. This option stands out because it facilitates secure and efficient communication between Cisco Identity Services Engine (ISE) and Network Access Devices (NADs). By leveraging HTTPS, data transmission is encrypted, thus ensuring the security and integrity of the updates being communicated. Additionally, REST APIs allow for efficient, stateless interactions, making it faster to send and receive updates compared to more traditional methods that might involve stateful connections or less optimized protocols.

The implementation of REST APIs also supports automation and integration with other systems, enabling a responsive management environment. This is particularly beneficial in dynamic network scenarios where updates may need to be deployed promptly and in a controlled manner, enhancing overall network security.

In contrast, the other options, while important in their contexts, do not directly facilitate the specific task of delivering environment updates from Cisco ISE to NADs in a way that balances speed and security as effectively as HTTPS servers with REST APIs. For instance, TACACS+ is primarily a protocol for authentication and accounting, while SSH focuses on providing a secure channel over an unsecured network. The CoA (Change of Authorization) profile, on the other hand, deals with altering permissions or access levels rather than the rapid distribution of