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单选题
通常，MPLS包头中有（）Bit用作标签（Label）；3个Bit的EXP，协议中没有明确，通常用作COS；1个Bit的S，用于标识是否是栈底，表明MPLS的标签可以嵌套；8个Bit的TTL。
A
16
B
19
C
20
D
24
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更多 “单选题通常，MPLS包头中有（）Bit用作标签（Label）；3个Bit的EXP，协议中没有明确，通常用作COS；1个Bit的S，用于标识是否是栈底，表明MPLS的标签可以嵌套；8个Bit的TTL。A 16B 19C 20D 24” 相关考题
考题
通常,MPLS包头中有()Bit用作标签(Label);3个Bit的EXP,协议中没有明确,通常用作COS;1个Bit的S,用于标识是否是栈底,表明MPLS的标签可以嵌套;8个Bit的TTL。
A.16B.19C.20D.24
考题
嵌入式系统中常用BIT（内置自检测）来检测硬件的状态。BIT通常可分为上电BIT、周期BIT、启动BIT、维护BIT等，其中不能影响应用软件正常运行的是（ ）。A.上电BIT
B.周期BIT
C.启动BIT
D.维护BIT
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 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
具备IS-IS GR能力的路由器重启前，IS-IS发出的Hello报文中，关于RR bit和RA bit描述正确的是（）。A、RR bit=1，RA bit=0B、RR bit=1，RA bit=1C、RR bit=0，RA bit=1D、RR bit=0，RA bit=0
考题
Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）A、The stack bit will only be used when LDP is the label distribution protocolB、The label is the last entry in the label stack.C、The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.D、The stack bit is reserved for future use.
考题
通常，MPLS包头中有（）Bit用作标签（Label）；3个Bit的EXP，协议中没有明确，通常用作COS；1个Bit的S，用于标识是否是栈底，表明MPLS的标签可以嵌套；8个Bit的TTL。A、16B、19C、20D、24
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
单选题MPLS Header长度为32bits，包括长度为20bits的标签，该标签用于报文转发；长度为3bits的EXP通常用来承载IP报文中的优先级，长度为1bit的栈底标志s，用来表明是否是最后一个标签（）A
作用类似IP头部的TTL，用来防止报文环路B
主要是用于标签管理时的控制C
用于标签分发时对上游设备的控制D
对于LSR进行限制
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
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What is the action of "pop" in the context of MPLS switching？（）A
It removes the top label in the MPLS label stack.B
It adds a top label in MPLS label stack.C
It replaces the top label in the MPLS label stack with another value.D
It replaces the top label in the MPLS label stack with a set of labels.E
None of above.
考题
单选题Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）A
The stack bit will only be used when LDP is the label distribution protocolB
The label is the last entry in the label stack.C
The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.D
The stack bit is reserved for future use.
考题
填空题灰度图像中，像素值通常用（）bit表示。
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