Cisco 200-125 Exam

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: Option D. Explanation
Explanation: 

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.

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