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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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To ensure voice packets are kept within the Committed Information Rate (CIR) of a Frame Relay link, what should be used in the CPE?()
A. prioritizationB. classificationC. fragmentationD. traffic shaping
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For acceptable voice calls, the packet error rate should be less than()%
A.0.01B.0.1C.1D.2.5
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【A popular service that has attercted the interest of companies and has home users alike is the sending of voice signals over an IP-based network, such as the Internet. The practice of making telephone calls over the internet has had a number of different names, including packet voice, voice over packet, voice over the internet, internet telephone, and Voice over Ip（Voip）. But it appears the industry has settled on the termVoice ove IP in reference to the internet protocol, which controls the transfer of data over the internet. There are currently three ways to deliver VoIp to users, the first technique is found at the corporate level. Many companies are offering VoIP systerms that operate over a local area network. These systems involve a fair amount of equipment, such as VoIP servers, special IP-enabled telephones, and routers that can direct telephone calls. Today a large portion of corporate sites have converted their older internal telephone systems to VoIP systems that opreate over a LAN, thus converging two systems into one. A second common solution is the one often encountered at home. Using existing telephones, a special converter is added between the telephone and a high speed internet（DSL or cable modem）connection. The converter digitizes the voice signal and creates a stream of packets that are then sent over an ip connection.The third technique involves smart cell phones. Never cell technologies are all packet-based, thus requiring a telephone call to be converted to digital packets and sending those packets over IP networks.】From the paragraph above，a popular service that has attracetd the interest of companies and home users,is termed as （） . The data transfer over the Internet is controlled by the （） . At corporate level, many companies have replaced their older internal telephone systerms with （） that oprerate over a local area network.A、voice over the internet B、voice over packet C、Voice over IP D、internet telephony A、packet B、internet protocol C、industry D、VoIp servers A、VoIP systems B、IP-enablde telephones C、VoIP servers D、routers
考题
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%
考题
Which two statements are true about voice packets in a LAN？ （Choose two.） （）A、 Voice traffic data flow involves large volumes of large packets.B、 Because a packet loss involves a small amount of data， voice traffic is less affected by packet losses than traditional data traffic is.C、 Voice carrier stream utilizes Real-Time Transport Protocol （RTP） to carry the audio/media portion of VoIP communication.D、 Voice packets are very sensitive to delay and jitter.E、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.
考题
Refer to the exhibit. A router has a 256 kbps Frame Relay circuit connected to interface serial 0/0. As a large FTP packet is being placed into the hardware transmit queue of interface serial 0/0， a voice packet is placed into the priority queue of that interface. How， and in what order， wi the packets be transmitted？（）A、the voice packet will be transmitted first， followed by the FTP packet in its entiretyB、the voice packet will be transmitted first， followed by the fragmented FTP packetC、the FTP packet will be fragmented and the voice packet will be interleavedD、the FTP packet will be transmitted first in its entirety， follow by the voice packet
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To ensure voice packets are kept within the Committed Information Rate （CIR） of a Frame Relaylink， what should be used in the CPE？（）A、 prioritizationB、 classificationC、 fragmentationD、 traffic shaping
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An internet is a combination of networks connected by (1). When a datagram goes from a source to a (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?
空白（5）处应选择（）A、pathwaysB、routersC、diagramsD、calls
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What is the advantage of using DTX for an MS? （）A、Increases battery lifeB、Better Bit Error Rate (BQRE)C、Higher strengthD、Increased bit rateE、Better voice quality
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What is the Cisco recommended setting for the Cisco Unified Wireless Network WLC Voice Call Admission Control Max RF Bandwidth to support the Cisco Unified Wireless IP Phone 7921G?（）A、nominally 30 percent to best align with Cisco Unified Communications System recommendationsB、100 percent to ensure that the VoWLAN calls can use all the available bandwidth, if neededC、system default of 75 percentD、40 to 60 percentE、voice CAC should be left disabled unless wired QoS is configured
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What is the typical marked DSCP value for a voice media packet in Voice over IP technology？（）A、AF41B、AF31C、AF21D、BEE、EF
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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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A branch router is configured with an egress QoS policy that was designed for a total number of 10 concurrent VOIP calls.Due to expansion， 15 VOIP calls are now running over the link， but after the 14th call was established， allcalls were affected and the voice quality was dramatically degraded.Assuming that there is enough bandwidth on the link for all of this traffic， which part of the QoS configuration should be updated due to the new traffic profile？（）A、Increase the shaping rate for the priority queue.B、Remove the policer applied on the priority queue.C、Remove the shaper applied on the priority queue.D、Increase the policing rate for the priority queue.
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A branch router is configured with an egress QoS policy that was designed for a total number of 10 concurrent VOIP Calls. Due to Expansion， 15 VOIP Calls are now running over the link， but after the 14th call was established， all calls were affected and the voice quality was dramatically degraded. Assuming that there is enough bandwidth on the link for all of this traffic， which part of the QOS configuration should be updated due to the new traffic profile？（）A、Increase the shaping rate for the priority queue.B、Remove the policer applied on the priority queue.C、Remove the shaper applied on the preiority queue.D、Increase the policing rate for the priority queue.
考题
Which two statements are true about the function of CAC？（）A、CAC provides guaranteed voice quality on a link.B、CAC artificially limits the number of concurrent voice calls.C、CAC is used to control the amount of bandwidth that is taken by a call on a link.D、CAC prevents oversubscription of WAN resources that is caused by too much voice traffic.E、CAC allows an unlimited number of voice calls while severely restricting，if necessary，other forms of traffic.F、CAC solves voice congestion problems by using QoS to give priority to UDP traffic.
考题
Telneting from any machine on the network is taking 75 seconds. Which of the following procedures should be checked to correct the error?（）A、 Check /etc/hosts. B、 Check /etc/resolv.conf. C、 Check for packet errors. D、 Check to see if the master server is up.
考题
单选题What is the typical marked DSCP value for a voice media packet in Voice over IP technology？（）A
AF41B
AF31C
AF21D
BEE
EF
考题
多选题Which two statements are true about the function of CAC？（）ACAC provides guaranteed voice quality on a link.BCAC artificially limits the number of concurrent voice calls.CCAC is used to control the amount of bandwidth that is taken by a call on a link.DCAC prevents oversubscription of WAN resources that is caused by too much voice traffic.ECAC allows an unlimited number of voice calls while severely restricting，if necessary，other forms of traffic.FCAC solves voice congestion problems by using QoS to give priority to UDP traffic.
考题
单选题To ensure voice packets are kept within the Committed Information Rate （CIR） of a Frame Relaylink， what should be used in the CPE？（）A
prioritizationB
classificationC
fragmentationD
traffic shaping
考题
单选题For acceptable voice calls， the packet error rate should be less than（）%A
0.01B
0.1C
1D
2.5
考题
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
In a VoIP network the CAC can be replaced with the LLQ QoS mechanism if it has been properly implemented.
考题
单选题Refer to the exhibit. A router has a 256 kbps Frame Relay circuit connected to interface serial 0/0. As a large FTP packet is being placed into the hardware transmit queue of interface serial 0/0， a voice packet is placed into the priority queue of that interface. How， and in what order， wi the packets be transmitted？（）A
the voice packet will be transmitted first， followed by the FTP packet in its entiretyB
the voice packet will be transmitted first， followed by the fragmented FTP packetC
the FTP packet will be fragmented and the voice packet will be interleavedD
the FTP packet will be transmitted first in its entirety， follow by the voice packet
考题
单选题For acceptable voice calls, the packet error rate should be less than（）%A
0.01B
0.1C
1D
2.5
考题
单选题To ensure voice packets are kept within the Committed Information Rate (CIR) of a Frame Relay link, what should be used in the CPE?（）A
prioritizationB
classificationC
fragmentationD
traffic shaping
考题
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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