For example, consider the case of two ISP's, A and B, who both have global networks. Additionally, they have peering agreements in both Europe and in Asia, which allows them to exchange data packets destined for the other's network at either location. Now suppose a European customer of ISP A wants to transmit a data packet to an Asian customer of ISP B. ISP A will receive the packet in Europe and has to decide where to send the packet next. The first option is to hand off the packet to ISP B in Europe, and let ISP B carry the packet to Asia to be delivered to its destination. This is called hot-potato routing, since ISP A hands off the packet at the earliest opportunity, as in a game of hot potato. The second option is for ISP A to carry the packet to Asia on its internal network, and hand it off to ISP B there. This is called cold-potato routing by symmetry, since ISP A keeps the packet in its internal network as long as possible.