Certified Information Systems Security Professional (CISSP) Practice Exam

Question: 1 / 1980

What function does a CSU/DSU serve in networking?

Network routing

Data encryption

Channel service connection

The function of a CSU/DSU (Channel Service Unit/Data Service Unit) in networking is primarily to facilitate a channel service connection. This device is essential for connecting digital lines provided by telecommunications companies, such as T1 or T3 lines, to a local area network (LAN) or to a router. The CSU/DSU is responsible for converting the digital signals from the data line into a format that can be utilized by the networking equipment, thus establishing the necessary connection for data communication.

This device also includes features for line conditioning, ensuring signal quality, and providing isolation to protect the network equipment from electrical interference or other disturbances that might occur on the external line. While it does have some monitoring capabilities, its primary role revolves around establishing and maintaining the connection between the external digital circuit and the internal network setup.

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Network monitoring

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