If your machine is connected to the internet (or VPN) via different network connections, depending on where you are, then the following two functions may be useful to you.

Get-ActiveConnection lists the names of all network connections that currently have an IP address assigned. Test-ActiveConnection accepts a keyword and checks to see whether there are currently any active connections with the keyword in their name.

function Get-ActiveConnection
    Get-WmiObject -Class Win32_NetworkAdapterConfiguration |
    Where-Object { $_.IPAddress } |
    Select-Object -ExpandProperty Description
function Test-ActiveConnection
  @(Get-WmiObject -Class Win32_NetworkAdapterConfiguration |
    Where-Object { $_.IPAddress } |
    Where-Object { $_.Description -like "*$Keyword*" }).Count -gt 0

Here is a quick example output:

PS> Get-ActiveConnection
Dell Wireless 1820A 802.11ac
PS> Test-ActiveConnection dell
PS> if ( (Test-ActiveConnection dell) ) { Write-Warning "Connected via DELL network card" }
WARNING: Connected via DELL network card

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