Thanks for your suggestion but Network usage and network devices is not the only I want to monitor, sorry may be I was not clear enough, what I need a is a complete picture of total infrastructure including server, printers, workstations, network bandwidth, devices Applications , network services, sites etc. We have no idea if the existing infrastructure is good enough for new organization, how does one define a base of minimum requirements? For me the starting point is to get first the entire existing infrastructure on paper, are there any defines rules to create such inventory?

Thanks
Shashi