If your machine is connected to the Internet more than once, let's say cabled and wireless at the same time, which connection is used? Here's a function that tells you (thanks for inspiration to fellow MVP Richard Siddaway):
function test-ipmetric { Get-WmiObject Win32_NetworkAdapter -Filter "AdapterType='Ethernet 802.3'" | ForEach-Object { $_.GetRelated('Win32_NetworkAdapterConfiguration') } | Select-Object Description, Index, IPEnabled, IPConnectionMetric }