Cisco CCNA Exam Tutorial: Five ISDN Details To Remember
CCNA exam success depends on mastering many technologies that are new to you, and few exam topics have more details than ISDN. ISDN isn’t just for your CCNA exam studies, though. While ISDN is dismissed by many, the fact is that there are many small and mid-size networks out there that use ISDN as their backup to frame relay. Some of these companies have spoke networks that use ISDN to connect to their hub as well, so it’s a great idea to know ISDN configuration and troubleshooting for your real-world career as well as passing the CCNA. With that in mind, let’s take a look at five common ISDN errors and how to avoid them.
With dialer map statements, remember that the phone number you put in the dialer map is the phone number of the remote router, not the local one. Look at it this way – if you want to call a friend on your cell, you don’t pick up your cell and dial your own number!
Speaking of dialer map statements, don’t forget the all-important broadcast option at the end of the command:
R1(config-if)#dialer map ip 172.12.21.1 name R2 broadcast...
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