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WAN Terms Demard, CSU/DSU, Modem


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Q18. Which of the following is a term associated with WAN terminology / is a WAN device? [Select all that apply].

A. Demarc


C. Modem


  Correct Answer: A, C, B, D



WANs are connected over serial lines that operate at lower speeds than LANs. Some important WAN terms are:
1. Modems: Modems connect to public telephone circuits through dial-up.
2. CSU/DSU: Stands for Channel Service Unit / Data Service Unit. CSU/DSUs are used for connecting to Central Office of a Telephone switching company and provides serial WAN connections.
3. Multiplexors (mux): Multiplexors combine two or more signals before transmitting on a single channel. Multiplexing can be done by sharing "time" or "frequency".
4. CPE stands for Customer Premise Equipment.
5. Demarc : Demarcation point between carrier equipment and CPE.

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