The Comcast router hand an IP to the external interface of the Fortinet, the internal interface of the Fortinet is handing out IPs to your internal network, including the powerconnect switch
Thank you for your answer.
In looking around, it seems that the file server I intended to have will have to be an Active Directory server since we will have people of differing access permissions utilizing the same server. This is my first time with Windows Server 2012 and I am wary of the dramatic change. I have fussed with a Windows 8 machine and am still getting familiar with it. I will do more digging for specifics but if I may ask...can the layout still be Internet to Comcast router to firewall to network switch to all computers including the server if it is the only one doing duty as the DHCP machine?