When a router analyzes the OSPF LSDB to calculate the best route to each subnet for
internal routes, it does the calculations in a specific order. Which answer below puts the
calculations in the correct order of operation? Choose the best answer.

A.
1. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking
the lowest total cost route for each subnet as the best route.
2. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1 LSAs
and based on any Type 2 network LSAs.
3. Runs SPF to find all possible paths through the area’s topology, from itself to each subnet.

B.
1. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1
LSAs and based on any Type 2 network LSAs.
2. Runs SPF to find all possible paths through the area’s topology, from itself to each subnet.
3. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking the
lowest total cost route for each subnet as the best route.

C.
1. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1
LSAs and based on any Type 2 network LSAs.
2. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking the
lowest total cost route for each subnet as the best route.
3. Runs SPF to find all possible paths through the area’s topology, from itself to each subnet.

D.
1. Runs SPF to find all possible paths through the area’s topology, from itself to each
subnet.
2. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1 LSAs
and based on any Type 2 network LSAs.
3. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking the
lowest total cost route for each subnet as the best route.