单项选择题

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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单项选择题

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

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

单项选择题

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

单项选择题

Which of the following is the purpose of QoS?（）

A. Load balance traffic across multiple LAN and WAN links.
B. Increase speed of network traffic.
C. Classify, mark, and prioritize traffic on WAN and LAN links
D. Guarantee traffic delivery.