Exam 300-415 topic 1 question 89 discussion

I think this is C. Local-AS and no-export will both accomplish limiting the advertisements to the local as but the default action reject will stop all advertisements for the other 71 servers. • local-as : Routes in this community are not advertised outside the local AS. • no-advertise : Attach the NO_ADVERTISE community to routes. Routes in this community are not advertised to other BGP peers. • no-export : Attach the NO_EXPORT community to routes. Routes in this community are not advertised outside the local AS or outside a BGP confederation boundary. To configure multiple BGP communities in a single list, include multiple community options, specifying one community in each option.

The examtopics selected right answer as B is misleading. According to answers of testers. Why examtopic is misleading payed users ?

for me it's C, no-export filter advertise to external peers. no-advertise filter advertise internal and external peers.

C is correct

B is definitely wrong.... The local AS community is a well known BGP community and can be used for BGP confederations. It’s basically the same as the no export community but this one works for within the sub-AS of a confederation. Prefixes that are tagged are only advertised to other neighbors in the same sub-AS, not to other sub-AS’es or eBGP routers