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.
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