— Exhibit —
user@R1> show ospf neighbor
Address Interface State ID Pri Dead
10.222.0.2 ge-0/0/1.0 Init 10.222.1.2 128 32
user@R1> show ospf interface detail
Interface State Area DR ID BDR ID Nbrs
ge-0/0/1.0 DR 0.0.0.0 10.222.1.1 0.0.0.0 1
Type: LAN, Address: 10.222.0.1, Mask: 255.255.255.252, MTU: 1500, Cost: 1
DR addr: 10.222.0.1, Priority: 128
Adj count: 0
Hello: 10, DeaD. 40, ReXmit: 5, Not Stub
Auth type: MD5, Active key ID. 10, Start time: 1970 Jan 1 00:00:00 UTC
Protection type: None
Topology default (ID 0) -> Cost: 1
lo0.0 DR 0.0.0.0 10.222.1.1 0.0.0.0 0
Type: LAN, Address: 10.222.1.1, Mask: 255.255.255.255, MTU: 65535, Cost: 0
DR addr: 10.222.1.1, Priority: 128
Adj count: 0
Hello: 10, DeaD. 40, ReXmit: 5, Not Stub
Auth type: None
Protection type: None
Topology default (ID 0) -> Cost: 0
user@R2> show ospf neighbor
user@R2> show ospf interface detail
Interface State Area DR ID BDR ID Nbrs
ge-0/0/1.0 PtToPt 0.0.0.0 0.0.0.0 0.0.0.0 0
Type: P2P, Address: 10.222.0.2, Mask: 255.255.255.252, MTU: 1500, Cost: 1
Adj count: 0
Hello: 10, DeaD. 40, ReXmit: 5, Not Stub
Auth type: MD5, Active key ID. 10, Start time: 1970 Jan 1 00:00:00 UTC
Protection type: None
Topology default (ID 0) -> Cost: 1
lo0.0 DR 0.0.0.0 10.222.1.2 0.0.0.0 0
Type: LAN, Address: 10.222.1.2, Mask: 255.255.255.255, MTU: 65535, Cost: 0

DR addr: 10.222.1.2, Priority: 128
Adj count: 0
Hello: 10, DeaD. 40, ReXmit: 5, Not Stub
Auth type: None
Protection type: None
Topology default (ID 0) -> Cost: 0
— Exhibit —

Refer to the Exhibit.
You are trying to establish an OSPF adjacency between R1 and R2, but the adjacency does not
establish.
Referring to the exhibit, what is causing the adjacency to fail?

A.
The MD5 key ID values are mismatched between R1 and R2.

B.
R1 has both family inet and family iso configured on the link toward R2.

C.
The IP subnet mask is mismatched between R1 and R2.

D.
The interface type is mismatched between R1 and R2.

Explanation: