Refer to the exhibit. You are the network administrator responsible for the NProuter, the
10.1.1.1 router, and the 10.1.1.2 router.
What can you determine about the OSPF operations from the debug output? Select the
best response.

A.
The NProuter has two OSPF neighbors in the “Full” adjacency state.

B.
The NProuter serial0/0 interface has the OSPF dead timer set to 10 seconds.

C.
The NProuter serial0/0 interface has been configured with an OSPF network type of
“point- to-point”.

D.
The 10.1.1.1 and 10.1.1.2 routers are not using thedefault OSPF dead and hello timers
setting.

E.
The “Mismatched” error is caused by the expiration of the OSPF timers.

Explanation:
First we should understand clearly about the line
Dead R120 C10,Hello R30 C30
The “R” here means “Received” and “C” means “Configured”. In other words, “Dead R” is
the Dead Timer Received from the neighbor and the “Dead C” is the Dead Timer of the local
router.
Therefore in this case “Dead R 120 C 10″means the Death Timer of the neighbor is 120
seconds while the local Dead Timer is 10 seconds, which causes a mismatch. Also we can
learn that the local OSPF dead timer is set to 10 seconds -> B is correct.
For your information, by default, OSPF uses a 10-second hello timer and 40-second hold
timer on broadcast and point-to-point links, and a 30-second hello timer and 120-second
hold timer for all other network types. So we can’tconfirm answer D is correct or not.