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Share some CCNA Routing and Switching 200-125 exam questions and answers below.
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. 
Answer: D

A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen? 
A. session 
B. transport 
C. network 
D. data link 
E. physical 
Answer: D

Which of the following describes the roles of devices in a WAN? (Choose three.) 
A. A CSU/DSU terminates a digital local loop. 
B. A modem terminates a digital local loop. 
C. A CSU/DSU terminates an analog local loop. 
D. A modem terminates an analog local loop. 
E. A router is commonly considered a DTE device. 
F. A router is commonly considered a DCE device. 
Answer: A,D,E

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