When talking about your home or business internet connection and its connection with the local "exchange". What is an "exchange"? Role does it play in the connection between your home and your ISP?
My assumptions are that is regional location for data lines from your house to connect to some sort of routing server which matches a port from the server to your routers IP address. TCP/IP would apply one unifed IP address to the data packets that are then pushed out to the ISP's main routing server?
Sorry if this sounds a little confusing. If so then ignore what I wrote an just clarify what the exchange is.