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What are two design guidelines for VoIP networks? （）
- A、Delay should be no more than 10 ms.
- B、Loss should be no more than1 percent.
- C、Jitter should be less then 40 ms.
- D、Managed bandwidth is strongly recommended for voice control traffic.
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多选题What are two design guidelines for VoIP networks? （）ADelay should be no more than 10 ms.BLoss should be no more than1 percent.CJitter should be less then 40 ms.DManaged bandwidth is strongly recommended for voice control traffic.
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多选题What are two design considerations for a WLAN to support voice?（）APacket loss is less than one percent.BSignal strength at cell edge is approximately -67 dBm.CEnd-to-end delay is less than 200 ms.DCell overlap between APs is 50 percent.
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单选题When you enable port security on an interface that is also configured with a voice VLAN， what is the maximum number of secure MAC addresses that should be set on the port？（）A
No more than one secure MAC address should be set.B
The default will be set.C
The IP phone should use a dedicated port， therefore only one MAC address is needed per port.D
No value is needed if the switchport priority extend command is configured. E
No more than two secure MAC addresses should be set.
考题
多选题Which two statements are true about voice packets in a LAN？ （Choose two.） （）AVoice traffic data flow involves large volumes of large packets.BBecause a packet loss involves a small amount of data， voice traffic is less affected by packet losses than traditional data traffic is.CVoice carrier stream utilizes Real-Time Transport Protocol （RTP） to carry the audio/media portion of VoIP communication.DVoice packets are very sensitive to delay and jitter.EVoice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.
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多选题What are two design guidelines for VoIP networks？（）ADelay should be no more than 10 ms.BLoss should be no more than 1 percent.CJitter should be less then 40 ms.DManaged bandwidth is strongly recommended for voice control traffic.
考题
单选题Which statement is NOT a key QoS recommended requirement for voice bearer traffic?（）A
Voice traffic should be marked to DSCP EF per the QoS baseline and RFC3246.B
Voice traffic loss should be no more than 3%.C
One-way latency （mouth-to-ear） should be less than 150 msec.D
Average one way jitter should be targeted to less than 30 msec.E
21-320 Kbps of guaranteed priority bandwidth is required per call depending on sample rate，codec，and layer 2 overhead.
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