Cisco 200-120 Exam Questions

200-120 Question 22


What is the difference between a CSU/DSU and a modem?


A.  A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.
B.  A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.
C.  A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.
D.  A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.


Correct Answer: D
Explanation/Reference:
CSU/DSU is used to convert digital signals from a router to a network circuit such as a T1, while a modem is used to convert digital signals over a regular POTS line.