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单选题
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？（）
A
end-to-end delay
B
interference from bulk data traffic
C
processing delays
D
serialization delays
E
jitter
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更多 “单选题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？（）A end-to-end delayB interference from bulk data trafficC processing delaysD serialization delaysE jitter” 相关考题
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To maintain a telephone conversation over the Internet. The voice packets must arrive at their destination in ()A.a continuous streamB.a burst streamC.a delayed streamD.a burst mode
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What ensures that voice packets are given priority throughout the network so that conversations arrive intact?()
A.CentrexB.Packet encryptionC.Intelligent call routingD.QoS
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When we use VolP service，the voice packets over the Internet arrive at their destination in a（ ） stream.A.burst B.delayed C.interrupted D.continuous
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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
Which three statements are true about the data traffic characteristics of voice traffic？ （）A、latency must be kept below 150 msB、latency is not a concern as long as jitter is kept below 30 msC、voice packets do not require a specific type of queuingD、voice packets are rather smallE、voice packets require TCP for rapid retransmission of dropped packetsF、voice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload
考题
Ensuring that data is transmitted securely over an IP network is the main purpose of：（）A、TelnetB、FTPC、SIPD、TLS
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
考题
Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）A、 Packets can arrive out of order.B、 Packets must take the same path to the destination.C、 Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.D、 Packets can experience varying delays across the network.E、 Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.
考题
Which statement best describes the application of link fragmentation and interleaving （LFI）？（）A、It compresses the Layer 2 payload and marks the packet as a high priority to be transmitted firstB、It fragments larger packets and allows VoIP packets to be transmitted in between them.C、It stops the transmission of large packets when priority packets arrive.D、It sends high priority packets in between normal traffic packets.
考题
VOIP has been implemented at the main office of the Company network. Which two statements are true about voice packets in a LAN？（）A、 Voice carrier stream utilizes Real-Time Transport Protocol (RTP) to carry the audio/media portion of the VoIP communication. B、 Voice traffic data flow involves large volumes of large packets. C、 Because a packet loss involves a small amount of data, voice traffic is less affected by packet losses than traditional data traffic is. D、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during delivery. E、 Voice packets are very sensitive to delay and jitter.
考题
If voice and data traffic will be sent and received via a WAN links， what must be configured to provide a certain amount of dedicated bandwidth and to prioritize the voice traffic over other types of network traffic？（）A、IPSec VPNB、QoS mechanismC、FirewallD、NATE、EIGRP routing protocolF、Static routing
考题
Why is QoS important in a converged network?（）A、Because data does not need to arrive intact, so data transfer rates can be variableB、Because lost voice-data packets must be retransmittedC、Because voice data packets should arrive quickly and sequentially, and with no lost dataD、Because voice data packets must follow a single dedicated path through the network
考题
What ensures that voice packets are given priority throughout the network so that conversations arrive intact?（）A、QoSB、CentrexC、Packet encryptionD、Intelligent call routing
考题
Which three functions can an Integrated Services Router perform in a VoIP network？（）A、 voice stream mixing for conference callingB、 voice gatewayC、 call admission controlD、 analog or digital phone interfacesE、 XML application servicesF、 large scale dial plan application
考题
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？（）A、end-to-end delayB、interference from bulk data trafficC、processing delaysD、serialization delaysE、jitter
考题
A network administrator has been receiving work orders about poor voice quality crossing a branch T1. The cause is determined to be users running high bandwidth file sharing applications across the T1 sending large packets delaying the smaller voice streams. Which of the following would improve voice quality?（）A、Configure traffic shaping to reduce the bandwidth available to the file sharing application.B、Configure a separate VLAN for the IP phones.C、Install a content caching proxy at the branch to reduce inbound WAN traffic.D、Upgrade switches to provide higher bandwidth ports for workstations and IP phones.
考题
多选题Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）APackets can arrive out of order.BPackets must take the same path to the destination.COnce packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.DPackets can experience varying delays across the network.EPackets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.
考题
单选题If voice and data traffic will be sent and received via a WAN links， what must be configured to provide a certain amount of dedicated bandwidth and to prioritize the voice traffic over other types of network traffic？（）A
IPSec VPNB
QoS mechanismC
FirewallD
NATE
EIGRP routing protocolF
Static routing
考题
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.
考题
多选题Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true？ （）AThe SDM QoS wizard will create two real-time traffic classes to handle VoIP and voice signaling packets.BThe SDM QoS wizard will create three real-time traffic classes to handle VoIP， voice signaling， and video packets.CThe SDM QoS wizard will create four real-time traffic classes to handle VoIP， voice signaling， video， and video streaming packets.DThe SDM QoS wizard will create two business-critical traffic classes to handle transactional and network management packets.EThe SDM QoS wizard will create three business-critical traffic classes to handle transactional， network management， and routing packets.FThe SDM QoS wizard will create four business-critical traffic classes to handle transactional， network management， routing， and best-effort packets.
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
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.
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.
考题
单选题Choose the false statement concerning the use of CiscoWorks Internetwork Performance Monitor (IPM) in a Teleworker deployment.（）A
IPM should not be run on a production network. B
IPM helps verify if a Service Provider is meeting the Service Level Agreement. C
IPM contains a database that can store data on latency, jitter, and drops of voice packets over a period of weeks or months. D
The QoS service policy should contain an allocation of sufficient bandwidth in the priority queue (LLQ) for both the SAA probe simulating a voice call and the voice call. If not, voice quality will suffer.
考题
单选题Why is QoS important in a converged network?（）A
Because voice data packets must follow a single dedicated path through the networkB
Because voice data packets should arrive quickly and sequentially, and with no lost dataC
Because lost voice-data packets must be retransmittedD
Because data does not need to arrive intact, so data transfer rates can be variable
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