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What is the purpose of the confederation identifier in a BGP confederation?
Correct Answer: D
In BGP confederations, the confederation identifier represents the external AS number for the entire confederation. The BGP confederation splits a single large autonomous system (AS) into smaller, manageable sub-ASes. These sub-ASes use private AS numbers internally but appear as a single unified AS to external BGP peers. The confederation identifier ensures that external BGP peers see the confederation as one cohesive AS rather than multiple smaller ASes.