Semester 4 Chapter 5 - (all questions at once)
Integrated Services Digital Network (ISDN) Chapter 5 provides an in-depth look at a still-important WAN technology, ISDN. At least 4 Objectives on the CCNA Certification Exam deal with ISDN; and ISDN is a required part of the TCS design. This Chapter is exceedingly technical and will require patience on the part of the students.
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