Free Cisco SPRI 300-510 Actual Exam Questions - Question 7 Discussion

C, because IOS XR needs a proper route back to the IOS router for BFD sessions.

B/D? BFD usually works across both platforms, so D feels off. B could be true if multihop for IPv4 isn’t supported in all IOS XR versions, but without version info, hard to say.

Maybe D because BFD is generally designed to be compatible across Cisco platforms, but some older IOS XR versions had limitations that could cause issues. A and C seem off since LDP isn’t essential, and routing or static routes are typically needed but not a strict IOS XR requirement for peer setup. B might be tempting, but I think IOS XR has supported IPv4 BFD multihop for a while now, so it doesn’t seem totally accurate to say it doesn’t support it at all.

Looks like A can be ruled out since LDP isn’t mandatory for BFD peer setup. C makes more sense because routing or static routes are generally needed for the peer to communicate. So, I’m going with C.

Does the question specify the IOS XR version? That affects BFD multihop support.