Alice is at a computer behind a NAT gateway that has the private IP address $10\mathrm{.}23\mathrm{.}44\mathrm{.}55.$ The gateway has the first IP address in the range; she has the fifty$-$fifth. She opens a connection to a file transfer server at $74\mathrm{.}125\mathrm{.}224\mathrm{.}80.$