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
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 unacceptable

B

end-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptable

C

end-to-end network delay is not a factor as long as the  delay is consistent

D

some packet loss can be corrected by codec algorithms

E

RSVP handles voice packet retransmission

F

fragmentation is a result of packet loss


参考解析

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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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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

多选题Which two QoS classification and marking statements are true? ()AIn a Frame Relay network, delay sensitive traffic is tagged with the discard eligible (DE) bit.BIn an MPLS network, the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field.CIn an MPLS network, the MPLS EXP bits are used to identify up to 16 CoS values.DThe differentiated services code point (DSCP) field consists of the first three bits of the IP precedence field in the header of an IP packet.EThe 802.1Q standard uses a three bit field referred to as the user priority bits (PRI) to mark packets as belonging to a specific CoS.

多选题Which two QoS classification and marking statements are true?()AIn a Frame Relay network, delay sensitive traffic is tagged with the discard eligible (DE) bit.BIn an MPLS network, the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP fieldCIn an MPLS network, the MPLS EXP bits are used to identify up to 16 CoS values.DThe differentiated services code point (DSCP) field consists of the first three bits of the IP precedence field in the header of an IP packet.EThe 802.10 standard uses a three bitfield referred to as the user priority bits (PRI) to mark packets as belonging to a specific CoS.

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.

多选题You are asked to configure real-time performance monitoring (RPM) between two Junos devices to track traffic in your network. Which two application traffic types can you track?()AICMPBSNMPCTCPDHTTPS

多选题The Cisco SDM will create a QoS policy that provides services to two types of traffic. Which two statements indicate the default QoS parameters that are created by SDM?()ABusiness-critical traffic will be sorted into two QoS classes.BReal-time traffic will be sorted into one QoS class.CVoice traffic will be considered real-time traffic while call signaling will be considered business-critical.DAll traffic except real-time will be considered best-effort.ERouting, management, and transactional traffic will be considered business-critical.FVoice and call signaling traffic will be considered real-time.

多选题You need to determine where the trust boundaries will be in a new Company VOIP design.  Which  two statements are true about these trust boundaries?()ATrust boundaries are configured in the core of the network to provide the most efficient  forwarding based upon QoS markings,BSetting trust boundaries at the edge of the network allows intermediate hop devices to  administer QoS policies without detailed packet identification.CTrust boundaries are used to determine which QoS mechanism will be applied to the traffic.DAt the trust boundaries, the untrusted traffic will be marked with a new QoS value appropriate  for the policy in place at the point where the traffic entered the campus network.ETrust boundaries define the firewall rules for QoS admission into a network.