You plan to configure authentication for OSPF. In which configuration mode should you configure OSPF authentication to use a specific key chain?
A . router ospf
B . global
C . vPC
D . interface
Answer: D
Explanation:
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/4_2/nx-os/unicast/configuration/guide/l3_cli_nxos/l3_ospf.html