The difference between line of demarcation and point of presence is:
Line of demarcation defines the connection point to the communication carrier.
Point of presence is the point where ownership of the communication equipment changes.

Question

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The line of demarcation actually marks the point where the telecommunications carrier's network ends and the building's internal wiring begins, essentially indicating the boundary of responsibility between the service provider and the customer. The Point of Presence (PoP), on the other hand, is a physical location where two or more networks or communication devices share a connection. It does not specifically denote a change in ownership of communication equipment but rather a location for connecting to the internet or other networks.

The Difference Between Line of Demarcation and Point of Presence