CISSP Practice Exam 2025 – Complete Prep Guide

In a network context, the term 'demarc' refers to the point at which the responsibility of the Internet Service Provider (ISP) ends and the responsibility of the customer begins. This is commonly known as the demarcation point. It is a critical element in network architecture as it defines the boundary for network hardware and the service provided by the ISP, establishing where the service provider's equipment ends and the customer’s equipment begins.

This demarcation point can encompass network components like the termination of cables, junction boxes, and various other devices that connect customer premises to the ISP's network. Understanding where this boundary lies is vital for troubleshooting connectivity issues, as it helps determine whether a problem lies within the ISP’s jurisdiction or within the customer’s internal network.

The other options described do not encapsulate the meaning of 'demarc'. Options that relate to encryption algorithms or standards pertain to data security, rather than the physical and operational boundaries within network infrastructure.