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单选题
In the context of configuring dial-on-demand routing using ISDN, what is the purpose of the dialer-list command?()
A

to identify valid numbers for incoming calls

B

to define the type of ISDN switch at the central office

C

to specify the list of outgoing phone numbers used by the router

D

to associate a dial configuration with a physical interface

E

to define interesting traffic that will enable the link


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