Ccna routing and Switching Complete Study Guide

Demarcation point   The demarcation point (demarc for short) is the precise spot where 

the service provider’s responsibility ends and the CPE begins. It’s generally a device in a 

telecommunications closet owned and installed by the telecommunications company (telco). 

It’s your responsibility to cable (extended demarc) from this box to the CPE, which is 

usually a connection to a CSU/DSU, although more recently we see the provider giving us 

an Ethernet connection. Nice!

Local loop   The local loop connects the demarc to the closest switching office, referred to 

as the central office.