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

考题 ● Serialization delay and （71） delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the （72） on the wire, and queuing delay (depth of the queue) are improved by increasing the （73） from a 128Kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （74） in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the （75） of the application will only result in an increased bandwidth with no positive effects on performance.

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考题 Serialization delay and(71)delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the(72)on the wire, and queuing delay(depth of the queue)are improved by increasing the(73)from a 128Kbps circuit to a THowever, three other components of delay, routing/switching deiay, distance delay, and protocol delay are components that can not be positively affected by an(74)in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the(75)of the application will only result in an increased bandwidth with no positive effects on performance.A．bufferingB．queuingC．receivingD．timing

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考题 What are two characteristics of the relationship between the Cisco PIN architecture and Cisco Validated Designs? ()(Choose two.) A. Cisco is focusing on Cisco Validated Designs as a means to driving integrated networks.B. Cisco is focusing on the PIN architecture as a means to driving integrated networks.C. The Cisco PIN architecture is a critical mechanism for supporting integrated markets because it can be implemented quickly.D. The Cisco Validated Designs program provides critical mechanisms for supporting integrated markets because the mechanisms can be implemented quickly.E. Cisco Validated Designs can be implemented quickly without customer input.

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考题 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.

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考题 What is the best description of serialization delay？（）A、the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interfaceB、the time it takes for a propagate from source to destinationC、the time it takes to place a frame on the physical medium for transportD、the time a packet resides in the outbound queue of a router

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考题 What are two characteristics of the relationship between the Cisco PIN architecture and CiscoValidated Designs? （）(Choose two.)A、Cisco is focusing on Cisco Validated Designs as a means to driving integrated networks.B、Cisco is focusing on the PIN architecture as a means to driving integrated networks.C、The Cisco PIN architecture is a critical mechanism for supporting integrated markets because it can be implemented quickly.D、The Cisco Validated Designs program provides critical mechanisms for supporting integrated markets because the mechanisms can be implemented quickly.E、Cisco Validated Designs can be implemented quickly without customer input.

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考题 What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.)A、It protects signals against node failures between rings.B、It protects signals against node failure within a single ring.C、It allows for traffic to be preempted when a ring switch occurs.D、Traffic can be dropped and continued at interconnecting nodes.E、It protects preemptible traffic from being dropped when a ring switch occurs.

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考题 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.

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考题 What are two possible actions an IOS IPS can take if a packet in a session matches a signature？（）A、reset the connectionB、forward the packetC、check the packet against an ACLD、drop the packet

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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

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考题 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.

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考题 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

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考题 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

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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

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考题 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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考题多选题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

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考题多选题What are two reasons for packet loss on a VoIP connection？（）Aserialization delayBoverrunCfull buffers and queuesDpropagation delayEshaping delayFTCP header errors

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考题多选题What are two possible actions an IOS IPS can take if a packet in a session matches a signature？（）Areset the connectionBforward the packetCcheck the packet against an ACLDdrop the packet

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考题多选题Which three statements about end-to-end delay are true？（）AEnd-to-end delay is the sum of propagation delays， processing delays， serialization delays， and queuing delays.BCoast-to-coast end-to-end delay over an optical link is about 20 ms.CProcessing delay depends on various factors， which include CPU speed， CPU utilization， IP switching mode， and router architecture.DPropagation and serialization delays are related to the media.EPropagation delay is the time it takes to transmit a packet and is measured in bits-per-second （bps）.FSerialization 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.

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考题多选题What are two characteristics of the relationship between the Cisco PIN architecture and Cisco Validated Designs? （）(Choose two.)ACisco is focusing on Cisco Validated Designs as a means to driving integrated networks.BCisco is focusing on the PIN architecture as a means to driving integrated networks.CThe Cisco PIN architecture is a critical mechanism for supporting integrated markets because it can be implemented quickly.DThe Cisco Validated Designs program provides critical mechanisms for supporting integrated markets because the mechanisms can be implemented quickly.ECisco Validated Designs can be implemented quickly without customer input.

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考题多选题What are two uses of NAT？（）Aconserving public IP addressesBallowing stateful packet inspectionCpreventing unauthorized connections from outside the networkDallowing networks with overlapping private address space to communicate

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考题多选题What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.)AIt protects signals against node failures between rings.BIt protects signals against node failure within a single ring.CIt allows for traffic to be preempted when a ring switch occurs.DTraffic can be dropped and continued at interconnecting nodes.EIt protects preemptible traffic from being dropped when a ring switch occurs.

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考题多选题What are three problems with the tail drop mechanism of managing interface congestion？（）AQueuing introduces equal delays for packets of the same flow， resulting in jitter.BWhen congestion occurs， dropping affects most of the TCP sessions， which simultaneously back off and then restart again.CAll buffers can temporarily be seized by aggressive flows， and normal TCP flows experience buffer starvation.DThere is no differentiated drop mechanism. Higher priority traffic is dropped in the same way as best-effort traffic.EIn TCP starvation， traffic exceeds the queue limit because of the bursty nature of packet networks. A router cannot handle multiple concurrent TCP sessions.FGlobal synchronization occurs because multiple TCP hosts reduce their transmission rates at random intervals in response to packet dropping

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考题多选题QoS refers to the ability of a network to provide improved service， over various underlying technologies， to select network traffic. Which two traits are inherent to QoS？（）Areference to network ability to provide improved service to all network trafficBreduction in delay， jitter， and packet lossCequal handling of all packetsDsupport for real-time applicationsEbest-effort actions

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考题单选题What is the best description of serialization delay？（）A the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interfaceB the time it takes for a propagate from source to destinationC the time it takes to place a frame on the physical medium for transportD the time a packet resides in the outbound queue of a router

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考题多选题What are two QoS mechanisms that are used to prevent packet loss？（）Aheader compressionBpayload compressionClow latency queuing （LLQ）Dweighted random early detection （WRED）Etraffic policingFtraffic shaping

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考题多选题What are two characteristics of dual-ring interconnect in SDH networks？（）AIt protects signals against node failures between rings.BIt protects signals against node failure within a single ring.CIt allows for traffic to be preempted when a ring switch occurs.DTraffic can be dropped and continued at interconnecting nodes.EIt protects preemptible traffic from being dropped when a ring switch occurs.

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