關於isdn的設定(ccna問題)

以下是架構 pc1 BRI0 <----------->ISDN Cloud<----------->BRI0 pc2 題目: Assuming that the ISDN switch doesn\'t require SPIDs, which of the following commands would you implement to bring up the ISDN connection and provide connectivity between the two routers? (Select three answer choices) A. Router(config-if)#... show more 以下是架構
pc1 BRI0 <----------->ISDN Cloud<----------->BRI0 pc2
題目:
Assuming that the ISDN switch doesn\'t require SPIDs, which of the following
commands would you implement to bring up the ISDN connection and provide
connectivity between the two routers? (Select three answer choices)
A. Router(config-if)# encapsulation HDLC
B. Router(config)# dialer-list 1 protocol ip permit
C. Router(config)# isdn switch-type type
D. Router(config)# dialer map ip address name connection number
E. Router(config-if)#dialer-group 1
F. Router(config-if)# ip address address subnet mask
請問答案是什麼?tk的答案是bef,我覺得是bcd,可是我又在網路上看到有人說...

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另外請教高手isdn的設定一定要和ddr一起用嗎?
如果我不使用ddr撥號的話,那isdn可以單用嗎?
因為isdn的指令在icnd的課本裡只有
switcy type 和spid而以(我是指bri config),因為在網路上有人這麼說:
---------------------------------------...
If you are not using DDR , the three basic commands that Cisco says you
need to configure when bringing up an ISDN link are:
RouterA(config)#isdn switch-type basic-ni
RouterA(config)#isdn dialer map ip address name name connection number
RouterA(config-if)#ip address address mask
---------------------------------------...
那是不是代表isdn可以不透過ddr的方式來設定連線?
請高手幫幫我(因為沒router只能用模擬器try,可是又try不出來)
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