For the CCNA exam, I know you mentioned ISDN is very lightly tested, if at all, but DDR is very important with it being popular overseas. Which ISDN did you mean is tested lightly?
Again, not being able to divulge too much, I can say that ISDN and Dial on Demand Routing (DDR) is certainly a valuable piece of information to know if you happen to be working with much ISDN overseas. However, as an exam objective, Cisco recognizes that it is waning technology and is focusing their market as well as their certifications on more modern technologies. For example, the CCNP BCRAN course of old was 50% ISDN and DDR configurations. Now, its Implementing Secure Converged Wide Area Networks replacement doesn't even list ISDN as a topic at all. It makes logical sense that the CCNA would follow suite with the CCNP and also begin to remove those topics.
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