You are testing the use of the automated port-access role configuration process using RadSec authentication over VXLAN. During your testing you observed that the RadSec connection will fan during the digital certificate exchange What would be the cause of this Issue? During the testing of RadSec authentication over VXLAN, if the RadSec connection fails during the digital certificate exchange, it typically indicates an issue with the establishment of the TLS tunnel, which is required for RadSec's secure communication. The failure of TLS tunnel establishment can occur due to RADIUS TCP packets being dropped, preventing the secure exchange of digital certificates necessary for RadSec authentication. The other options, such as IPv6 address reachability, tracking mode settings, and proxy server misconfiguration, are not directly related to the failure of the TLS tunnel establishment during the certificate exchange process
A. The RadSec server was defined on the switch using an IPv6 address that was unreachable
B. Tracking mode was set to 'dead-only', and the RadSec server was marked as unreachable
C. The switch is configured to establish a TLS connection with a proxy server, not the radius server
D. The RADIUS TCP packets are Being dropped and the TLS tunnel is not established