# Fill in these variables with your values
$ServerList = "s2dnode1", "s2dnode2", "s2dnode3"
$FeatureList =  "Failover-Clustering", "Data-Center-Bridging", "RSAT-Clustering-PowerShell", "FS-FileServer"

# This part runs the Install-WindowsFeature cmdlet on all servers in $ServerList, passing the list of features into the scriptblock with the "Using" scope modifier so you don't have to hard-code them here.
Invoke-Command ($ServerList) {
    Install-WindowsFeature -Name $Using:Featurelist
}