A. DTLS or TLS tunnel with vSmart controller and IPsec tunnel with vBond controller
B. DTLS or TLS tunnel with vBond controller and IPsec tunnel with vManage controller
C. DTLS or TLS tunnel with vBond controller and IPsec tunnel with other WAN Edge routers
D. DTLS or TLS tunnel with vSmart controller and IPsec tunnel with other WAN Edge routers