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Why is QoS important in a converged network?（）
- A、Because voice data packets must follow a single dedicated path through the network
- B、Because voice data packets should arrive quickly and sequentially, and with no lost data
- C、Because lost voice-data packets must be retransmitted
- D、Because data does not need to arrive intact, so data transfer rates can be variable
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更多 “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” 相关考题
考题
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
考题
What ensures that voice packets are given priority throughout the network so that conversations arrive intact?()
A.CentrexB.Packet encryptionC.Intelligent call routingD.QoS
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
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.
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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.
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Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true？ （）A、 The SDM QoS wizard will create two real-time traffic classes to handle VoIP and voice signaling packets.B、 The SDM QoS wizard will create three real-time traffic classes to handle VoIP， voice signaling， and video packets.C、 The SDM QoS wizard will create four real-time traffic classes to handle VoIP， voice signaling， video， and video streaming packets.D、 The SDM QoS wizard will create two business-critical traffic classes to handle transactional and network management packets.E、 The SDM QoS wizard will create three business-critical traffic classes to handle transactional， network management， and routing packets.F、 The SDM QoS wizard will create four business-critical traffic classes to handle transactional， network management， routing， and best-effort packets.
考题
What ensures that voice packets are given priority throughout the network so that conversations arrive intact?（）A、CentrexB、Packet encryptionC、Intelligent call routingD、QoS
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
You work as a network technician at Company. Your boss， Mrs.， is interested in LWAPP （Lightweight Access Point Protocol）. What should you tell her regarding this technology？ （）A、 LWAPP is a proprietary protocol， and because of its very high overhead it is not widely adopted.B、 Control traffic is encapsulated in UDP packets with a source port of 1024 and a destination port of 12223.C、 Layer 3 LWAPP is a UDP/IP Frame that requires a Cisco Aironet AP to obtain an IP address using DHCP.D、 Data traffic is encapsulated in UDP packets with a source port of 1024 and a destination port of 12223.E、 Control traffic is encapsulated in TCP packets with a source port of 1024 and a destination port of 12223.F、 Data traffic is encapsulated in TCP packets with a source port of 1024 and a destination port of 12223.
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
When troubleshooting a network， the output of the command show interfaces indicates a large number of runts. What is a runt？（）A、the number of packets that are discarded because they exceed the maximum packet size of the mediumB、errors created when the CRC generated by the originating LAN station or far-end device does not match the checksum calculated from the data received.C、the number of packets that are discarded because they are smaller than the minimum packet size of the mediumD、the number of received packets that were ignored by the interface because the interface hardware ran low on internal buffersE、the number of times that the interface requested another interface within the router to slow down
考题
Which three practices are important to the implementation of a DiffServ QoS architecture？（）A、 Because services are allocated throughout the network before the transmission of data begins， traffic classes can be guaranteed QoS services.B、 Traffic classes are marked with Layer 2 markings to allow for more granularity in identifying traffic classes.C、 Traffic classes are marked with Layer 3 markings to allow them to traverse different network types without loss of QoS information.D、 Traffic classes allow networks to provide proper QoS treatment of packets without applications having to request services.E、 Based upon the network capabilities， QoS markings are placed on packets as needed throughout the network to allow for proper QoS treatment of packets.F、 QoS markings are placed on packets as close to the network edge as possible to allow distribution and core devices to determine QoS actions as quickly as possible.
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 are two major sources of delay that can be managed by QoS in voice-enabled networks？（）A、propagation delayB、voice packet serialization delayC、congested egress queuesD、header overheadE、packets dropped because of CRC errors
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
Authentication for user data traffic is important, but so is authentication for IP voice traffic. The Cisco 830 802.1 feature provides an easier method for allowing IP voice traffic through the VPN, because it（）.A、requires access lists to identify the voice traffic B、can allow traffic from a device without 802.1X authentication, by MAC addressC、can allow traffic from Cisco IP phones by listening to their CDP advertisementsD、allows all packets marked with a ToS of 5 to bypass authenticationE、allows all IP voice packets to bypass authentication via stateful inspection
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
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
考题
单选题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
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
多选题Which three practices are important to the implementation of a DiffServ QoS architecture？（）ABecause services are allocated throughout the network before the transmission of data begins， traffic classes can be guaranteed QoS services.BTraffic classes are marked with Layer 2 markings to allow for more granularity in identifying traffic classes.CTraffic classes are marked with Layer 3 markings to allow them to traverse different network types without loss of QoS information.DTraffic classes allow networks to provide proper QoS treatment of packets without applications having to request services.EBased upon the network capabilities， QoS markings are placed on packets as needed throughout the network to allow for proper QoS treatment of packets.FQoS markings are placed on packets as close to the network edge as possible to allow distribution and core devices to determine QoS actions as quickly as possible.
考题
单选题When troubleshooting a network， the output of the command show interfaces indicates a large number of runts. What is a runt？（）A
the number of packets that are discarded because they exceed the maximum packet size of the mediumB
errors created when the CRC generated by the originating LAN station or far-end device does not match the checksum calculated from the data received.C
the number of packets that are discarded because they are smaller than the minimum packet size of the mediumD
the number of received packets that were ignored by the interface because the interface hardware ran low on internal buffersE
the number of times that the interface requested another interface within the router to slow down
考题
多选题Which three statements are true about the data traffic characteristics of voice traffic？ （）Alatency must be kept below 150 msBlatency is not a concern as long as jitter is kept below 30 msCvoice packets do not require a specific type of queuingDvoice packets are rather smallEvoice packets require TCP for rapid retransmission of dropped packetsFvoice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload
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
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 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
多选题Authentication for user data traffic is important, but so is authentication for IP voice traffic. The Cisco 830 802.1 feature provides an easier method for allowing IP voice traffic through the VPN, because it（）.Arequires access lists to identify the voice trafficBcan allow traffic from a device without 802.1X authentication, by MAC addressCcan allow traffic from Cisco IP phones by listening to their CDP advertisementsDallows all packets marked with a ToS of 5 to bypass authenticationEallows all IP voice packets to bypass authentication via stateful inspection
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