Which three of the following are configuration steps that must be completed on a NAD before Cisco ISE can send the device Cisco TrustSec environment data?

In the context of integrating a Network Access Device (NAD) with Cisco Identity Services Engine (ISE) for Cisco TrustSec functionality, it is essential to establish a secure environment where the NAD can communicate effectively with ISE. The chosen answer highlights a crucial step in this process.

When leveraging TrustSec, the Policy Assertion Credential (PAC) key plays a pivotal role. The PAC key is necessary for secure communications that enable the NAD to authenticate users and endpoints effectively while also securing the trust negotiation process. Configuring a PAC key for each Cisco ISE server within the NAD ensures that the device can securely procure the necessary environment data, leveraging TrustSec policies for proper segmentation and access control. This setup is fundamental for the NAD to process security group tags (SGTs) and enforce security policies based on identity.

For the other options presented, while they may be valid considerations in broader configuration scenarios involving Cisco ISE and NAD, they do not specifically address the requirement for TrustSec to function optimally. TACACS+ credentials, for instance, are part of authentication and authorization management but do not directly relate to the data transmission for TrustSec. Similarly, SSH credentials facilitate secure remote management and are not solely tied to the TrustSec configuration. Finally, general network