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For acceptable voice calls, the packet error rate should be less than()%
A.0.01
B.0.1
C.1
D.2.5
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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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Which two statements are true about network voice traffic？ （Choose two.）（）A、 Voice traffic is affected more by link speed than FTP traffic is.B、 Voice traffic is affected more by packet delays than FTP traffic is.C、 Voice streams involve larger packet sizes than most TCP network traffic involves.D、 Voice traffic is more sensitive to packet loss than TCP network traffic is.E、 Voice traffic requires QOS mechanisms only in heavily loaded network segments.
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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 than 1 percent.C、 Jitter should be less then 40 ms.D、 Managed bandwidth is strongly recommended for voice control traffic.
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单选题If the effective bearing area has been reduced , remedial action should be taken（）A
by more than 5 percentB
by less than 10 percentC
to 95 percentD
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单选题For acceptable voice calls， the packet error rate should be less than（）%A
0.01B
0.1C
1D
2.5
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单选题Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）A
CAC is used to allocate enough bandwidth for the number of calls that are allowed on the VoIP network.B
CAC is used to protect the quality of the voice calls by preventing call establishment if enough resources are not available on the network.C
CAC provides queuing mechanisms for voice calls if the packets exceed the configured or budgeted rate.D
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单选题For acceptable voice calls, the packet error rate should be no higher than what value?（）A
0.1%B
1%C
2.5%D
25%
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多选题VOIP has been implemented at the main office of the Company network. Which two statements are true about voice packets in a LAN？（）AVoice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media portion of the VoIP communication.BVoice traffic data flow involves large volumes of large packets.CBecause a packet loss involves a small amount of data, voice traffic is less affected by packet losses than traditional data traffic is.DVoice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.EVoice packets are very sensitive to delay and jitter.
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单选题For acceptable voice calls, the packet error rate should be less than（）%A
0.01B
0.1C
1D
2.5
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单选题Evaluate the following SQL statement used to create the PRODUCTS table： CREATE TABLE products （product_id NUMBER（3） PRIMARY KEY， product_desc VARCHAR2（25）， qtyNUMBER（8，2）， rate NUMBER（10，2）， total_value AS （ qty * rate）） PARTITION BY RANGE （total_value） （PARTITION p1 VALUES LESS THAN （100000）， PARTITION p2 VALUES LESS THAN （150000）， PARTITION p3 VALUES LESS THAN （MAXVALUE）） COMPRESS FOR ALL OPERATIONS； Which statement is true regarding this command？（）A
It executes successfully but partition pruning cannot happen for this partition key.B
It produces an error because the TOTAL_VALUE column cannot be used as a partition key.C
It produces an error because compression cannot be used for the TOTAL_VALUE partition key. D
It executes successfully but the values in the TOTAL_VALUE column would not be physically stored in the partitions.
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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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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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单选题Which statement is true about IP telephony calls？（）A
A Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and Layer 2 link header.B
The voice carrier stream uses H323 to set up， maintain， and tear down call endpoints.C
Call control signaling uses Real-Time Transport Protocol （RTP） packets that contain actual voice samples.D
The sum of bandwidth necessary for each major application， including voice， video， and data， should not exceed 75 percent of the total available bandwidth for each link.
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