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Which BGP feature allows a router to maintain its current BGP configuration while it advertises a different AS number to new connections?
Correct Answer: A
Explanation/Reference: Explanation: The local-AS feature allows a router to appear to be a member of a second autonomous system (AS), in addition to its real AS. This feature can only be used for true eBGP peers. The local-AS feature is useful if ISP-A purchases ISP-B, but ISP-B's customers do not want to modify any peering arrangements or configurations. The local-AS feature allows routers in ISP-B to become members of ISP-A's AS. At the same time, these routers appear to their customers to retain their ISP-B AS number. Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13761- 39.html