Where is the point between the customers site and the phone
carrier that responsibility changes?
A.) CO
B.) Demarc
C.) DCE
D.) DTE
E.) CPE
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Answer: B
The DEMARCATION POINT (Demarc) in North America is between
the customers
CSU/DSU and the Local Telco Office, because Americans own
the DSU/CSU.
Elsewhere in the world, the Demarc is between the Router and the
CSU/DSU, because outside the USA the Telco owns the DSU/CSU.
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CCNA 
