which purpose does a northbound API serve in a controller-based networking architecture?

Refer to the exhibit. An engineer just installed network 10.120.10.0/24. Which configuration must be applied to the R14 router to add the new network to its OSPF routing table?

Which state does the switch port move to when PortFast is enabled?

What is the purpose of the ip address dhcp command?

Refer to the exhibit Routers R1 R2 and R3 use a protocol to identify their neighbors' IP addresses hardware platforms, and software versions. A network engineer must configure R2 to avoid sharing any neighbor information with R3, and maintain its relationship with R1. What action meets this requirement?