A systems manager is in charge of endpoint devices and wants to specify using a trusted CA. What should the systems manager specify?

In the context of specifying the use of a trusted Certificate Authority (CA) for endpoint devices, selecting trusted providers is a suitable choice. This approach emphasizes the importance of relying on CAs that are widely recognized and trusted within the industry. Trusted providers typically have established reputations for security and reliability, thus ensuring that the certificates issued by them can be relied upon for authenticating endpoint devices and establishing secure communications.

Choosing trusted providers helps to mitigate risks associated with less reputable CAs that may not adhere to stringent security practices or may be more vulnerable to compromise. By selecting recognized and trusted CAs, a systems manager can enhance the overall trustworthiness of the endpoint device environment and ensure that cryptographic operations are conducted securely.

The other options, while relevant in different contexts, do not directly address the request for specifying a trusted CA. For instance, cross certification involves establishing trust relationships between different CAs, which can complicate the trust model. A single CA limits flexibility and redundancy, while a hierarchical CA model, which involves a root CA and subordinate CAs, may not simplify the situation if the goal is simply to establish a clear trust relationship without added complexity. Thus, specifying trusted providers serves the systems manager's purpose of ensuring reliable and secure endpoints.