A WAN circuit enters a company facility at the Demarc and then connects to the customer premise equipment installed in which location?

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Think of the demarc as the edge between the service provider’s network and your internal network. After that boundary, the equipment that terminates the WAN and hands the signal to the rest of your LAN is placed where the internal cabling comes together—the intermediate distribution frame, or IDF. The IDF is a network closet or room on a part of the building where cables from the demarc are terminated and distributed to the rest of the floor or area, making it the logical point for installing the customer premise equipment that interfaces with the WAN. The MDF is a larger central hub for broader building-wide wiring, not the immediate termination point for this single WAN entry, and while a CSU/DSU is part of the CPE used to connect to the service, the typical location for the CPE itself is the IDF.