Author: David Wolsefer
Focus: CCNA & CCIE Security
Issue Date: Mar 1, 2023
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ISDN and DDR
This Tutorial attempts to cover all ISDN/DDR material likely to be on
the CCNA exam. As a result of your ISDN studies, you should be
able to answer any test questions about ISDN, PPP, and DDR. In
addition to helping you pass the exam, learning ISDN well will give
you a very important foundation for further progress in your
internetworking knowledge and career. 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.
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