A user configured OSPF and advertised the Gigabit Ethernet interface in OSPF. By default, to which type of OSPF network does this interface belong? 

Answer options:

A. point-to-multipoint
B. point-to-point
C. broadcast
D. nonbroadcast

C

The Broadcast network type is the default for an OSPF enabled ethernet interface (while Point-to-Point is the default OSPF network type for Serial interface with HDLC and PPP encapsulation). Reference: https://www.oreilly.com/library/view/cisco-ios-cookbook/0596527225/ch08s15.html