Answer:
Demarcation point
Step-by-step explanation:
There is point that is set by engineers for the entrance of the cables to provide different services such as Telephone, internet and other utilities. At this point a device has been installed, in which service provider and end users plugin their cables.
Service providers is responsible for any service degradation till this point. After this point user is responsible for any damage. This point is called Demarcation point .