單項選擇題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?（）

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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3.單項選擇題Which of the following Frame-Relay encapsulation commands would you use, if you had to connect your Cisco router to a non-Cisco router?（）

A. TestKRouter(config-if)# Encapsulation frame-relay dot1q
B. TestKRouter(config-if)# Encapsulation frame-relay aal5snap
C. TestKRouter(config-if)# Encapsulation frame-relay ietf
D. TestKRouter(config-if)# Encapsulation frame-relay isl
E. None of the above

4.單項選擇題A new frame-relay network is being implemented and inverse ARP does not appear to be operating correctly. Which alternative command can be used to provide connectivity?（）

A. frame-relay arp
B. frame-relay map
C. frame-relay interface-dlci
D. frame-relay lmi-type
E. frame-relay pvc

5.單項選擇題When configuring Frame Relay using point-to-point subinterfaces, which of the following must not be configured?（）

A. The local DLCI on each subinterface of the Frame Relay.
B. The Frame Relay encapsulation on the physical interface.
C. An IP address on the physical interface.
D. The subinterface type as point-to-point