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问ip precedence有几个bit？
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考题
Which two statements about subnet masks are true?()
A.If a bit is turned on (1), the corresponding bit in the IP address is used for the host portion.B.If a bit is turned off (0), the corresponding bit in the IP address is used for the host portion.C.If a bit is turned on (1), the corresponding bit in the IP address is used for the network prefix.D.If a bit is turned off (0), the corresponding bit in the IP address is used for the network prefix.
考题
以下对于DSCP描述正确的是()。
A.在网络入口处对分组进行分类，流量控制，设置DSCP值。B.在网络中根据DSCP值，进行队列调度，分组丢弃。C.IP报文TOS字节的前6个bit定义为DSCP值。D.DSCP的定义也向前兼容IP Precedence。
考题
可以对报文的哪些信息对报文进行标记或重标记()
A.ip DSCP.ip precedencE.802.1p.EXP信息B.ip Source.Destination Address.EXP信息C.MAC Address信息D.报文中的任何信息
考题
Which two QoS classification and marking statements are true？ （）A、 In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.B、 In 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.C、 In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.D、 The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.E、 The 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.
考题
Which configuration would make an IP SLA probe use a precedence value of 5？（）A、ip sla 1 icmp-echo 1.1.1.1 tos 160B、ip sla 1 icmp-echo 1.1.1.1 tos 20C、ip sla 1 icmp-echo 1.1.1.1 precedence 5D、ip sla 1 icmp-echo 1.1.1.1 dscp 20
考题
DSCP value "101110" looks like which IP Precedence value to non-DiffServ compliant devices？（）A、IP Precedence 2B、IP Precedence 3C、IP Precedence 4D、IP Precedence 5E、IP Precedence 6F、IP Precedence 7
考题
Which two QoS classification and marking statements are true？（）A、 In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.B、 In 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 fieldC、 In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.D、 The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.E、 The 802.10 standard uses a three bitfield referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.
考题
Which four of these statements are restrictions for Frame Relay PVC bundles with QoS support for IP and MPLS？ （）A、A PVC bundle will not come up unless all the precedence， DSCP， and EXP levels are configured in thebundle.B、A PVC bundle can perform precedence and DSCP matching at the same timeC、A PVC bundle may contain no more than sixteen PVCsD、A PVC can be in only one PVC bundleE、A PVC bundle cannot perform precedence and DSCP matching at the same time.F、A PVC bundle may contain no more than eight PVCs.
考题
Which three characteristics of the traffic flow are taken into consideration when the QoS-for-VPNs feature （QoS pre-classify） provides packet classification and applies appropriate QoS service on tunnel interfaces？（）A、IP precedence bitsB、DSCP bitsC、original port numbersD、DE bitsE、source IP addressF、destination IP address
考题
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.
考题
多选题Which two statements about subnet masks are true?（）AIf a bit is turned on (1), the corresponding bit in the IP address is used for the host portion.BIf a bit is turned off (0), the corresponding bit in the IP address is used for the host portion.CIf a bit is turned on (1), the corresponding bit in the IP address is used for the network prefix.DIf a bit is turned off (0), the corresponding bit in the IP address is used for the network prefix.
考题
单选题Which traffic descriptor s can be recognized and categorized by cisco quality of service（qos）features？（）A
incoming interface.outgoing interface.ip precedence.and differentiated services code P.oint（DSCP）.B
Incoming interace.ip precedence.differentiated services code point（DSCP），and source or d.estination address.C
Outgoing interface.ip precedence.differentiated services code point（DSCP）.and source or d.estination address.D
Incoming interface .outgoing interface.ip precedence and differentiated code point s.ervices（DCPS）E
Incoming interface .ip precedence .and source or destination address. F
Outgoing interface.ip precedence .and source or destination address.
考题
多选题以下关于DSCP和IP Precedence的比较的说法正确的是（）。ADSCP可以兼容IP PrecedenceB因为DSCP扩展了用于流分类的比特位，所以不能简单的映射到IP Precedence里面去CDSCP包括6比特而IP Precedence包括3比特D因为仅仅可以使用RFC定义的DSCP，DSCP在使用上比IP Precedence更受限制
考题
多选题Which three statements about classification marking of traffic at Layer 2 are true？ （）Aa Frame Relay header includes a 1-bit discard eligible （DE） bit to provide the class of service （CoS）Ban ATM header includes a 1-bit DE field to provide the CoSCan MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoSDthe CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link （ISL） trunking is usedEin the IEEE 802.1p standard， three bits are used to identify the user priority bits for the CoSFin the IEEE 802.1q standard， six bits are used to identify the user priority bits for the CoS
考题
判断题IP组播地址的前4bit是固定的1110，对应组播MAC地址的高25bit。IP组播地址的后28bit中只有23bit被映射到MAC地址，因此丢失了5bit的地址信息，直接结果是由32个IP组播地址映射到同一个MAC地址上A
对B
错
考题
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.
考题
单选题DSCP value "101110" looks like which IP Precedence value to non-DiffServ compliant devices？（）A
IP Precedence 2B
IP Precedence 3C
IP Precedence 4D
IP Precedence 5E
IP Precedence 6F
IP Precedence 7
考题
单选题下列IP Precedence的取值中，代Critical的业务流量的是（）A
0B
2C
5D
6
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