Inter$-$AS$.$ Consider the network topology as follows. There are multiple ASes in the network. A$$ E indicate routers within AS$1.$ X and Y are gateway routers of AS$131$ and AS$105.$ Link costs in AS$1$ are labelled in the figure. AS$1$ is a customer network of AS$105$ and AS$131.11\mathrm{.}11\mathrm{.}11\mathrm{.}0/24$ is a customer network of AS$132$ and AS$105.22\mathrm{.}22\mathrm{.}22\mathrm{.}0/24$ is a customer network of AS$132$ and AS$106.$