I'm having some confusion about what is an MDF and IDF. I have two buildings, one building has the high speed internet connection, all the servers, etc. The first building, the (MDF) then feeds another building that is connected to it by fiber. The second location, IDF only has a few switches in it. The second building get's internet, files, etc.. from the first building. I refer to this setup as an MDF at the first building and IDF in the second building. Others refer to them both as MDF.