ISDN and Dial on Demand Routing

In terms of preparing for the CCIE lab, I feel that ISDN is probably the second most important topic to master because a significant number of points on the lab exam can come from ISDN- and DDR-related topics. It's worth remembering that ATM, ISDN, and Frame Relay were all developed as part of the same standards process, a process that followed and drew from the OSI model development. This Study Guide will attempt to address the level of ISDN and DDR knowledge needed for both the written and the lab portion of the CCIE exam.

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