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
What are two major sources of delay that can be managed by QoS in voice-enabled networks？（）
- A、propagation delay
- B、voice packet serialization delay
- C、congested egress queues
- D、header overhead
- E、packets dropped because of CRC errors
相关考题：
What ensures that voice packets are given priority throughout the network so that conversations arrive intact?() A.CentrexB.Packet encryptionC.Intelligent call routingD.QoS
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.
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.
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.
What ensures that voice packets are given priority throughout the network so that conversations arrive intact?（）A、CentrexB、Packet encryptionC、Intelligent call routingD、QoS
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.
What is the goal of QoS in a network？ （）A、prevent packets from being droppedB、increase available bandwidthC、reduce hardware errorsD、provide predictable network serviceE、eliminate propagation delayF、eliminate jitter and packet loss
In the design of a QoS solution， which two factors should be taken into consideration？（）A、 On congested links， all forms of traffic will require some form of QoS.B、 All traffic types and requirements should be examined to determine the number of traffic classes required.C、 In the implementation of link efficiency mechanisms on links that typically transport relatively large packets， header compression will be most efficient.D、 In the implementation of link efficiency mechanisms on links that typically transport relatively small packets， header compression will be most efficient.E、 In the implementation of link efficiency mechanisms on links that typically transport relatively small packets， payload compression will be most efficient.F、 Payload compression provides more available bandwidth and reduces processing delay time.
Which two networking infrastructure characteristics are most likely to distinguish video requirements （such as Cisco TelePresence） from voice requirements？（）A、jitterB、delayC、PoED、bandwidthE、packet loss
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.
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
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.
Your Service Provider does not support Link Fragmentation and Interleave, but upstream serialization delay on your broadband link is affecting voice quality. Which two mitigation strategies are viable?（）A、Upgrade your residential broadband service to at least 768kbps uplink.B、Switch your home router to use PPP encapsulation.C、Use the ip tcp adjust-mss interface command.D、Employ QoS techniques to drop large data packets.E、Use traffic shaping to interrupt large data packets.
Which three statements about end-to-end delay are true？（）A、End-to-end delay is the sum of propagation delays，processing delays，serialization delays，and queuing delays.B、Coast-to-coast end-to-end delay over an optical link is about 20 ms.C、Processing delay depends on various factors，which include CPU speed，CPU utilization，IP switching mode， and router architecture.D、Propagation and serialization delays are related to the media.E、Propagation delay is the time it takes to transmit a packet and is measured in bits-per-second （bps）.F、Serialization delay is the time it takes for a router to take the packet from an input interface and put it into the output queue of the output interface.
Which two statements are true about the application of QoS in a converged network？（）A、end-to-end network delay times that exceed 50 ms for real-time traffic are considered unacceptableB、end-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptableC、end-to-end network delay is not a factor as long as the delay is consistentD、some packet loss can be corrected by codec algorithmsE、RSVP handles voice packet retransmissionF、fragmentation is a result of packet loss
What are two reasons for packet loss on a VoIP connection？（）A、serialization delayB、overrunC、full buffers and queuesD、propagation delayE、shaping delayF、TCP header errors
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
What are two QoS mechanisms that are used to prevent packet loss？（）A、header compressionB、payload compressionC、low latency queuing （LLQ）D、weighted random early detection （WRED）E、traffic policingF、traffic shaping
For which two network problems would QoS be a good solution？（）A、serialization delayB、end-to-end delayC、lack of bandwidthD、inconsistent port costsE、routing table convergence issuesF、poor file transfer rates
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.
多选题Which two statements are true about the application of QoS in a converged network？（）Aend-to-end network delay times that exceed 50 ms for real-time traffic are considered unacceptableBend-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptableCend-to-end network delay is not a factor as long as the delay is consistentDsome packet loss can be corrected by codec algorithmsERSVP handles voice packet retransmissionFfragmentation is a result of packet loss
多选题What are two reasons for packet loss on a VoIP connection？（）Aserialization delayBoverrunCfull buffers and queuesDpropagation delayEshaping delayFTCP header errors
单选题What is the goal of QoS in a network？ （）Aprevent packets from being droppedBincrease available bandwidthCreduce hardware errorsDprovide predictable network serviceEeliminate propagation delayFeliminate jitter and packet loss
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.
单选题Refer to the exhibit. With an IPSec tunnel established between remote Router A and head-end router B, with Compressed Real-Time Protocol (cRTP) configured on the serial interface of Router A, what impact will the cRTP configuration have on the Voice over IP packets flowing through the IPSec tunnel from a Cisco 7960 IP phone?（）A Twenty bytes of header will be replaced with five bytes. B If the IPSec transform set includes Authentication Header, the receiving IPSec peer will discard the packets. C The IPSec packets will be dropped by Router A's compression logic.D The voice packets will not be compressed.
多选题What are two major sources of delay that can be managed by QoS in voice-enabled networks？（）Apropagation delayBvoice packet serialization delayCcongested egress queuesDheader overheadEpackets dropped because of CRC errors