Refer to the exhibits.
Exhibit 1.
Exhibit 2.
The exhibits show the current operational state for routes on Switch-3 to send all traffic to 172.16.0.0/16 through Switch-2 during normal operation.
Which single configuration change creates the desired behavior?
To ensure all traffic to 172.16.0.0/16 is sent through Switch-2 during normal operation, it's crucial to understand how OSPF metrics influence path selection. OSPF uses cost to determine the best path, where lower cost paths are preferred. Both type 1 and type 2 external metrics are used in OSPF, but type 1 metrics consider both the internal and external cost, while type 2 metrics consider only the external cost and are generally used when internal network costs can be ignored. Currently, type 2 metrics are in use as indicated in the external LSAs. Changing the OSPF external metric type to 1 on Switch-1 and setting a high cost (100) on Switch-3 VLAN 108 will ensure Switch-2 is the preferred path by making the cost of the path through Switch-1 significantly higher. This targeted change aligns with the objective of creating the desired behavior with a single configuration adjustment.
In re-reading this, I think the key is in the question: "which single configuration change"....my original choice, B, is two configuration changes. That only leaves D, and an assumption that there is a redistribution of static routing.
B is the answer
Concur with B
D is right, Type-1 are preferred over Type-2. If we just change the cost on Switch@1 for redistribution would be enought
B. A & D are hard to confirm whether the switches are "static routing" or "connected" interfaces to the redistributed network. So those are eliminated. Switch C is our path chosen, so increasing the metric of that VLAN segment makes the path less desired