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Q18. Which of the following is a term associated with WAN terminology / is a WAN device? [Select all that apply].
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A. Demarc B. DSU/CSU C. Modem D. CPE
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Correct answer: A, B, C, D
Explanation:
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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