The new Microsoft template of SharePoint 2013 architecture includes new services. The design of SharePoint 2013 infrastructure has always 3 servers’ roles:
Web server, Application server and Database server.
Microsoft had published different SharePoint 2013 farm topology.
In this example, a Six-Server virtualized farm.
Example of Office Web Apps 2013 & SharePoint 2013 Architecture
Example of SharePoint 2013 with Distributed Cache Service