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單項(xiàng)選擇題

A demarcation point is usually installed and managed by which of the following providers?（）

A. Web host provider
B. VoIP company
C. Telephone company
D. Hardware manufacturer

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單項(xiàng)選擇題

Prioritizing traffic between data and voice is defined as which of the following?（）

A. Caching engines
B. Proxy server
C. QoS
D. Load balancing

單項(xiàng)選擇題

Which of the following LAN technology has a MAXIMUM range of 10,000 meters (6 miles)?（）

A.10GBase-ER
B.10GBase-SW
C.10GBase-LW
D.10GBase-EW