It is impossible to understand about strategic IT management with the help of TOGAF. The infrastructure portfolio Management is capable to manage applications as well as your infrastructure components, it consists of:
• WAN, LAN and other network components and severs (PC, server cluster- mainframe computers)
• Infrastructure services like operating system services (real or virtual) and other basic services like archiving, printing etc.
• Almost all the infrastructure components are commodities in most of the enterprises. You will be more concerned about the cost reduction while you have a responsibility to provide a guaranteed service. So there will be chances of skipping a lot of dimensions that you would deal within Application Portfolio Management and go primarily for dimensions like cost, homogeneity and simplicity of a portfolio.