Free Cisco 300-420 Actual Exam Questions - Question 11 Discussion
Refer to the exhibit. AS65533 and AS65530 are announcing a partial Internet routing table as well as
their IP subnets. An architect must create a design that ensures AS64512 become a transit AS. Which
filtering solution must the architect choose?
A imo, max-prefix filtering limits the number of routes an AS can advertise, which might help control what passes through AS64512 while still letting it be a transit. That fits better than no-advertise or no-export here.
It sounds like the goal is to let AS64512 act as a transit AS, so it should be able to advertise routes beyond its own AS. That rules out D (No Export), since that stops route propagation outside the AS. I'd pick C for next-hop modification to enable proper transit.
C. Next-hop makes sense here because changing the next-hop attribute can force AS64512 to become a transit AS by influencing the route path selection. Other options don’t affect transit behavior directly.
Option D seems off since no-export limits route advertisement within the local AS. Maximum-prefix (A) just controls the number of routes, not transit behavior. No-advertise (B) would stop routes from being advertised outside, so that’s also counterproductive if AS64512 needs to be transit. I think C, Next-hop, makes sense because adjusting next-hop could force AS64512 to be in the path as a transit AS. Not 100% sure though-this one is a bit tricky.