creating a better understanding as to what an infrastructure looks like/exists of

Dear networking community,

For my job in Tech sales I am trying to create a better understanding as to what the networking infrastructure looks like for different types and sizes of companies. On a rare basis I see some network diagrams passing by and I find these really interesting to be able to create a general idea. Are there some people who are open to share their networking diagram or a brief summary as to what their office infrastructure looks like?

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Thanks in advance!