Which Cisco ACI feature allows the encryption of communication over TEP addresses connecting sites via the intersite network in a Cisco Multi-Site deployment?

TrustSec provides policy-based access and segmentation, but it is not the feature responsible for encrypting inter-site TEP communication in ACI Multi-Site.

IPsec is the underlying protocol used by CloudSec, but CloudSec is the specific Cisco ACI Multi-Site feature that implements this encryption.

MACsec operates at Layer 2 for point-to-point link encryption and is not used for encrypting inter-site TEP traffic over an IP-based intersite network.

CloudSec is a feature within Cisco ACI Multi-Site that uses IPsec ESP to encrypt data plane traffic and IKEv2 for key exchange, ensuring secure communication between ACI sites over the intersite network.