CCNP系列認證CCNP(642-845)單項選擇題每日一練(2019.01.10)

來源：考試資料網(wǎng)

1 Which statement is true about a distributed call control environment and the processing of dialed digits from an IP phone？（）

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2 Voice activity detection （VAD） suppresses the transmission of silence patterns. On average， and assuming that a link carries at least 24 calls， what percentage of total bandwidth could VAD save？（）

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3 Using the G.729 codec and the default cRTP configuration， what is the approximate VoIP bandwidth savings across a Frame Relay link that adds a 6 byte frame header？"（）

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4 What is the goal of QoS in a network？（）

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5 A stream of voice packets transmitted over a WAN network encounters differing queuing delays. One router in the path used by the voice packets delays some of the packets for 4 ms while transmitting a large video file， but delays other packets only 2 ms. Another router delays some packets 5 ms， but transmits others in 2 ms. How would you best describe this type of problem？（）

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