READ Free Dumps For Cisco- 200-125
| Question ID 13508 | What is the difference between a CSU/DSU and a modem? |
| Option 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. |
| Option 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. |
| Option 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. |
| Option 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 |
| Question ID 13509 | Which of the following describes the roles of devices in a WAN? (Choose three.) |
| Option A | A CSU/DSU terminates a digital local loop. |
| Option B | A modem terminates a digital local loop. |
| Option C | A CSU/DSU terminates an analog local loop. |
| Option D | A modem terminates an analog local loop. |
| Option E | A router is commonly considered a DTE device. Explanation: The idea behind a WAN is to be able to connect two DTE networks together through a DCE network. The networks DCE device (includes CSU/DSU) provides clocking to the DTE- connected interface (the routers serial interface).
A modem modulates outgoing digital signals from a computer or other digital device to analog signals for a conventional copper twisted pair telephone line and demodulates the incoming analog signal and converts it to a digital signal for the digital device. A CSU/DSU is used between two digital lines - For more explanation of answer D, in telephony the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the carrier or telecommunications service providers network. Therefore a modem terminates an analog local loop is correct.
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| Correct Answer | A,D,E |
