Suppose that Internet routing in the US used geographical routing, and the rst 12 bits of every IP address represent a geographical area similar in size to a telephone area code. Megacorp gets the prex 12.34.0.0/16, based geographically in Chicago, and allocates subnets from this prex to its ofces in all 50 states. Megacorp routes all its internal trafc over its own network. (c). Suppose Megacorp gives up and gets a separate geographical prex for each ofce. What must it do to ensure that its internal trafc is still routed over its own network?