Which element of the Cisco SD-WAN architecture facilitates the functions of controller discovery and NAT traversal?

Which AES mode should be used in a Cisco SD-WAN environment that includes multicast applications?

A network administrator is troubleshooting a DMVPN setup between the hub and the spoke.
Which action should the administrator take before troubleshooting the IPsec configuration?

Refer to the exhibit. Which solution decreases the EIGRP convergence time?

Refer to the exhibit. A customer is planning to onboard three new VPN partner connections in the data center. The new subnets must not overlap with the existing data center network, and the subnet size must not be bigger than necessary. The customer dedicated 10.1.8.0/21 for this design. How must the subnets be divided to meet these requirements?