CompTIA Network+ Exam Review

Answer - C - The traffic that enables the process of dialing from a router to another using an ISDN link is called interesting traffic.

Key Takeaway: The interesting packet activates the dialing sequence in an ISDN connection and resets the “idle-timeout” timer. Interesting traffic gets the link up and once the link is up, any traffic can cross the link. The lack of interesting traffic brings the link down.