What is YANG used for?
Which solution supports end to end line-rate encryption between two sites?

Refer to the exhibit. POSTMAN is showing an attempt to retrieve network device information from Cisco Catalyst Center (formerly DNA Center) API. What is the issue?
An engineer must create an EEM applet that sends a syslog message in the event a change happens in the network due to trouble with an OSPF process. Which action should the engineer use?
event manager applet LogMessage
event routing network 172.30.197.0/24 type all