多项选择题

Which of the following features would BEST be used to optimize real-time voice and video chat?（）(Select TWO)

A. Load balancing
B. Caching engines
C. Qos
D. Fault tolerance systems
E. Traffic shaping

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单项选择题

A. 25 meters (82 feet)
B. 100 meters (328 feet)
C. 500 meters (1640 feet)
D. 1000 meters (3280 feet)

单项选择题

A. Remote console
B. Statefulness
C. Address translation
D. Zones

单项选择题

A. 802.1q tag
B. Port
C. Application
D. IP address