Which role does OpenStack serve in SDN?

Refer to the exhibit.

You have configured your Contrail cluster to mirror traffic going between a network called frontend and a network called backend, however, the Wireshark window is not showing any packets being mirrored.
Referring to the exhibit, which statement is correct?

Two virtual machines in different virtual networks are not able to communicate with each other.
Which two troubleshooting steps would you help to identify this problem? (Choose two.)

Which feature of an SDN continuously monitors and analyzes the health of the network?

Refer to the exhibit.

Referring to the exhibit, when the user attempts the API request, which HTTP return code is generated by OpenStack?