I think the answer is D because both AP and Switch use PAPI . Moreover in AOS-CX switch currently not support port based tunnel. AOS-CX switch only support User Based Tunnel (UBT)
Page 749 Study Guide:
The switch uses two protocols to connect to an Aruba Mobility Controller (MC) The control plane uses PAPI (UDP port 8211) - the same protocol used by AP- to- MC communications. However, where APs use IPSec to protect the PAPI connection between the AP and MC, AOS- CX switches do not support this protection. Instead, you can optionally implement an MD5 HMAC function to protect PAPI between the AOS- CX switches and MCs.
[Aruba Networks]
should be D, the switch uses two protocols to connect to an MC: PAPI (control plane) and GRE (data plane). However, where APs use IPSec to protect the PAPI connection between the AP and MC, AOS-CX switches do not support this protection. Instead, you can optionally implement an MD5 HMAC function to protect PAPI between the AOS-CX switches and MCs
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