Understanding the Network Setup:
The OSPF network consists of three areas (Area 1, Area 0, and Area 2).
The server's subnet192.168.1.0/24is directly connected to R1 and imported into OSPF using the command:
import-route direct type 1 cost 2
Thetype 1specifies the route as anOSPF Type 1 external route, meaning both the external cost and the internal OSPF cost will be included when calculating the total cost.
The external cost specified for the imported route is2.
Cost Calculation to R2:
The interfaces between the routers are GE interfaces, and the default cost for GE interfaces is1.
The path from R2 to the server goes through the following hops:
R2 # R1:Cost = 1 (intra-area link).
R1 # Server:External cost = 2 (specified in theimport-routecommand).
Total cost to R2:
Intra-area cost (1) + External cost (2) = 3
Verification of Each Option:
Option A (2):Incorrect. This only accounts for the external cost, ignoring the internal OSPF cost.
Option B (4):Incorrect. This overestimates the cost by adding an extra hop.
Option C (3):Correct. The total cost is3(1 for the intra-area link + 2 for the external cost).
Option D (1):Incorrect. This ignores the external cost of the imported route.
References:
HCIA-Datacom Study Guide, Chapter: OSPF Route Types and Cost Calculation Huawei OSPF Cost Configuration Details