JNCIE-SP Practice Questions - Juniper Networks Certified Expert, Service Provider Routing And Switching Exam

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A large SP network uses BGP confederations divided into three member-ASes. A prefix learned from an external peer is carried through two confederation member-ASes before reaching the egress ASBR. What is in the AS_PATH of that prefix as seen by the external peer receiving it?

The path contains the member-AS numbers in parenthetical notation followed by the originating external AS The path contains only the confederation AS number, stripping all member-AS information The path contains all member-AS numbers plus the confederation AS number and the external AS The path contains only the originating external AS number because confederations strip internal path information at the ASBR egress

Correct Answer:

The path contains only the confederation AS number, stripping all member-AS information

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