Refer to the exhibit. The failover time of ISP-2 is significantly shorter than ISP-1 when an interface on the ISP router toward the campus network fails. Which solution minimizes the downtime to the sub-second?
It's D as Next-hop scans every 60 seconds, that's not sub-second as required. Also it doesn't say we cannot ask the ISP to add BFD. I worked for an ISP and we would implement BFD if customers wanted it.
BFD requires you to apply config on both routers. Since you do not have control over the ISP router I would think it would not be an option and B would be the answer.
BFD provides sub-second failure detection (https://howdoesinternetwork.com/2018/bfd), and next-hop tracking is enabled in IOS by default (https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/sbbnhop.html) and has a 5 second delay by default. So, I strongly believe it's BFD
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