dism /online /enable-feature /featurename:NetFX3 /all /Source:d:\sources\sxs /LimitAccess
... but i had an issue with installation getting following error.
PS C:\Users\Administrator> dism /online /enable-feature /featurename:NetFX3 /all /Source:d:\sources\sxs /LimitAccess
Deployment Image Servicing and Management tool
Image Version: 6.3.9600.17031
The source files could not be found.
Use the "Source" option to specify the location of the files that are required to restore the feature. For more informat
ion on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.
The DISM log file can be found at C:\Windows\Logs\DISM\dism.log
Some more information about this issue: