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fjohnson
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Post subject: WAN question
Posted: Thu Nov 18, 2010 10:47 am
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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.

I want to see what the answer is, I don't understand the modem and the csu/dsu part.
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xerobyte
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Post subject:
Posted: Thu Nov 18, 2010 2:09 pm
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The answer is A, D, E.

A: A CSU/DSU terminates a digital local loop.

A CSU/DSU is used for example to connect a customer to a T1 line (digital line). They can look like a modem or be built into a WAN card in a router. The DTE device (usually a router) connects to the CSU/DSU. So a CSU/DSU terminates a digital line.

D. A modem terminates an analog local loop.

An example of this is a dial up connection. The modem converts data to an acceptable form to go over the phone line (analog). The modem terminates the analog line.
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fjohnson
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Post subject:
Posted: Thu Nov 18, 2010 4:09 pm
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I guess that "D" is the one I don't understand. In my studies it says that "A Modem converts digital signal to Analog, Then back again".
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xerobyte
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Post subject:
Posted: Fri Nov 19, 2010 3:41 pm
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Ok, think of it this way.


---Computer -- Switch -- Modem -- Analog line

--- digital --- digital -- digital - analog -- analog

When traffic is coming back from the internet it is in analog form when it's going over the analog line, when it gets to the modem the modem will convert it back to digital.

So a modem does "converts digital signal to Analog, Then back again. BUT at the same time it's the termination of the analog local loop.
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fjohnson
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Post subject:
Posted: Fri Nov 19, 2010 7:36 pm
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Thank you, thats makes more sense.
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RockingRock
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Post subject:
Posted: Fri Apr 27, 2012 5:14 am
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the answer is
B
D
E
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kidvelvet
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Posted: Sun May 06, 2012 10:55 pm
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RockingRock wrote:
the answer is
B
D
E


No, a modem does not terminate a digital local loop; a CSU/DSU does.
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