Comprehensive and Detailed Step-by-Step Explanation:
Analysis of the OSPF Neighbor State:
Router ID 10.0.5.5:
On interface 10.0.235.2 (GigabitEthernet0/0/1), the neighbor state is Full, indicating that adjacency is established.
The Designated Router (DR) is 10.0.235.5, which is the same as the neighbor's address.
Router ID 10.0.4.4:
On interface 10.0.24.2 (Serial1/0/1), the neighbor state is also Full, meaning adjacency is established.
The DR/BDR election status shows None, indicating that the interface is on a point-to-point link where DR
/BDR election does not apply.
Validation of Each Option:
Option A: Correct. The DR IP address is explicitly shown as 10.0.235.5.
Option B: Correct. The neighbor state for both 10.0.5.5 and 10.0.4.4 is Full, confirming adjacency is established.
Option C: Incorrect. DR/BDR elections are irrelevant on point-to-point links like Serial1/0/1.
Option D: Correct. The Router IDs of R2's neighbors are explicitly listed as 10.0.5.5 and 10.0.4.4.
References:
HCIA-Datacom Study Guide, Chapter: OSPF Neighbor Relationships
Huawei OSPF Neighbor and Adjacency Details