All MDS machines have the personal firewall enabled, this reduces the chances of your machine being attacked. Machines that have shared printers, although they still have firewall protection are more at risk. Sharing a printer requires a policy called File and Print sharing being enabled, a policy that is sometimes exploited by hackers. The recommended approach for print sharing is to have a true network printer, therefore disabling the File and Print option and making your machine more secure.
For more information on printing recommendations please visit the following: