单选题In an enterprise setting, access switches providing network connectivity placed throughout abuilding are typically connected to a backbone called the:（）AMDFBProxyCDemarcation pointDSmart jack
单选题
In an enterprise setting, access switches providing network connectivity placed throughout abuilding are typically connected to a backbone called the:（）
A
MDF
B
Proxy
C
Demarcation point
D
Smart jack
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