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
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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. -
单项选择题
A network administrator needs to add an additional connection to a room. The administrator adds a new Ethernet switch and must connect it to an existing switch. Which cable type should be used to connect the two switches?（）
A. CAT3 cable
B. Serial cable
C. Crossover cable
D. Rollover cable
