Online T-carrier eLearning Training
From Serebra Learning Corporation
WAN Fundamentals
This course explains the emerging WAN internetworking technologies. It also covers the basics of data communication, digital data services. This course is designed for technical managers, help desk/support personnel and professionals who require an understanding of WAN, MAN, internetworking, digital data services, and advanced data communications.
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From 123-CBT Computer Based Training
CCNT Basic Data Communications v6 0 Part 1

...itched 56 digital service.
Identify capabilities of the T-Carrier system.
Identify features of Switched Multimegabit Data Service (SMDS).
Identify characteristics of Integrated Services Digital Network (ISDN).
Identify features of X.25.
Identify features of Frame Relay.
Identify capabilities of Asynchronous Transfer Mode (ATM).
Identify features of host computers.
Differentiate
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