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初级工程师
  
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20. Referring to the following diagram, what functions does the Frame Relay DLCI provide with respect to RouterA?
A. Identifies the signaling standard between RouterA and the frame switch
B. Identifies a portion of the virtual circuit between RouterA and the frame switch
C. Identifies the encapsulation used between RouterA and RouterB
D. Defines the signaling standard between RouterB and the frame switch.
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