Consider the following network. ISP B provides national backbone service to regional ISP A. ISP C provides national backbone service to regional ISP D. Each ISP consists of one AS. Band C peer with each other in two places using BGP. Consider traffic going from A to O. B would prefer to hand that traffic over to C on the West Coast (so that C would have to absorb the cost of carrying the traffic cross-country), while C would prefer to get the traffic via its East Coast peering point with B (so that B would have carried the traffic across the country). What BGP mechanism might C use, so that B would hand over A-to-O traffic at its East Coast peering point? To answer this question, you will need to dig into the BGP specification.

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ISP A ISP C ISP D