Refer to the exhibit. The show ip ospf interface command has been executed on R1. How is OSPF configured?
From the output we can see there are Designated Router & Backup Designated Router for this OSPF domain so this is a broadcast network (point-to-point and point-to-multipoint networks do not elect DR & BDR).
By default, the timers on a broadcast network (Ethernet, point-to-point and point-to-multipoint) are 10 seconds hello and 40 seconds dead. The timers on a non- broadcast network are 30 seconds hello 120 seconds dead.
From the line ג€Neighbor Count is 3ג€, we learn there are four OSPF routers in this OSPF domain.