How can an ISDN interface be used as a backup link for a primary interface and still use DDR to communicate with other sites?

A. By using dialer profiles.

B. An ISDN interface cannot be both.

C. With the command backup interface serial 0/0 on the bri0/0 interface along with normal DDR commands.

D. With the command backup interface bri 0/0 on the physical interface and normal DDR commands on the bri0/0 interface


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Saad Ahmed
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I believe by using dialer profiles.


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You are correct. But won't D also do the job. Please explain.


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