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单选题

You have just obtained a modular Cisco router with 2 serial connections and a BRI/U interface. What other physical piece of hardware is required in order to establish an ISDN connection?()

发布日期:2022-07-19

You have just obtained a modular Cisco router with...
A

Nothing. The router is already suitable.

B

A BRI WAN interface in the router.

C

An external NT1 to terminate the local loop.

D

A TA/NT1 device on the router.

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