Network Link Speed
The root\wmi Namespace contains a class that just returns the link speed of your network card. Quick and easy to use function.
function get-linkspeed{
param(
[string]$computer="."
)
Get-WmiObject -Namespace root\wmi -Class MSNdis_LinkSpeed `
-ComputerName $computer |
select InstanceName, @{N="Speed(Mbps)"; E={$_.NdisLinkSpeed/10000}}
}
The documentation I could find suggested that the NdisLinkSpeed property returned Kbps but that gave some odd results. Experimentation and a bit more research suggested I needed to divide by 10000.