Examinethefollowingoptions,whichSpanningTreeProtocol(STP)protectionmechanismdisablesaswitchportiftheportreceivesaBridgeProtocolDataUnit(BPDU)?() A.Uplink FastB.Port FastC.BPDUGuardD.RootGuard
Examinethefollowingoptions,whichSpanningTreeProtocol(STP)protectionmechanismdisablesaswitchportiftheportreceivesaBridgeProtocolDataUnit(BPDU)?()
A.Uplink Fast
B.Port Fast
C.BPDUGuard
D.RootGuard
相关考题：
STP交换机会发送BPDU。关于BPDU的说法正确的是（）。A.BPDU是使用IEEE802.3标准的帧B.BPDU是使用EtherentII标准的帧C.BPDU帧的Control字段值为3D.BPDU帧的目的MAC地址为广播地址
下列对STP生成树结构的描述中，错误的是（ ）。A.STP无论是根的确定，还是树状结构的生成，主要依靠BPDU提供的信息B.在配置BPDU的Bridge ID中，优先级的取值范围是0～61440C.拓扑变化通知BPDU数据包的长度不超过4个字节D.配置BPDU数据包的长度小于等于32个字节
以下不属于生成树协议(STP)拓扑改变信息的报文是()。 A.拓扑改变通知BPDU（TopologyChangeNotificationBPDU）B.拓扑改变通知配置BPDU（TopologyChangeNotificationConfigurationBPDU）C.拓扑改变确认配置BPDU（TopologyChangeAcknowledgeConfigurationBPDU）D.拓扑改变配置BPDU（TopologyChangeConfigurationBPDU）
在STP协议中,配置信息是通过BPDU协议数据包来进行转发的,那么对于配置BPDU报文,以下说法正确的是() A.配置BPDU不能在指定端口上发送B.配置BPDU只能在指定端口上发送C.配置BPDU能够在任意角色的端口上发送D.以上说法都不正确
下面说法正确的是（）A、MSTP和RSTP能够互相识别对方的协议报文，可以互相兼容B、在STP兼容模式下，设备的各个端口将向外发送STP BPDU报文C、在RSTP模式下，设备的各个端口将向外发送RSTP BPDU报文，当发现与STP设备相连时，该端口会自动迁移到STP兼容模式下工作D、在MSTP模式下，设备的各个端口将向外发送MSTP BPDU报文，当发现某端口与STP设备相连时，该端口会自动迁移到STP兼容模式下工作
STP交换机会发送BPDU。关于BPDU的说法正确的是（）。A、BPDU是使用IEEE802.3标准的帧B、BPDU是使用EtherentII标准的帧C、BPDU帧的Control字段值为3D、BPDU帧的目的MAC地址为广播地址
After configuring FabricPath， the following appears in the syslog： %STP-2-L2GW_BACKBONE_BLOCK： L2 Gateway Backbone port inconsistency blocking port port-channel100 on VLAN0010. What is the cause of this message？ （） A、 STP must be disabled； message indicates that STP is enabled.B、 STP is misconfigured； root guard must be disabled.C、 An inferior BPDU is received on a Cisco FabricPath edge port.D、 A superior BPDU is received on a Cisco FabricPath edge port.
Examine the following options，which Spanning Tree Protocol （STP） protection mechanism disables aswitch port if the port receives a Bridge Protocol Data Unit （BPDU）？（）A、Uplink FastB、Port FastC、BPDU GuardD、Root Guard
Which statement correctly describes enabling BPDU guard on an access port that is also enabled for PortFast？（）A、Upon startup， the port transmits 10 BPDUs. If the port receives a BPDU， PortFast and BPDU guard are disabled on that port and it assumes normal STP operation.B、The access port ignores any received BPDU.C、If the port receives a BPDU， it is placed into the error-disable state.D、BPDU guard is only configured globally and the BPDU filter is required for port-level configuration.
Which two statements are true about BPDU port-guard and BPDU filtering？（）A、BPDU port-guard can be enabled globally， whereas BPDU filtering must be enabled on a per-interface basis.B、When globally enabled， BPDU port-guard and BPDU filtering apply only to PortFast enabled ports.C、When globally enabled， BPDU port-guard and BPDU filtering apply only to trunking-enabled ports.D、When a BPDU is received on a BPDU port-guard enabled port， the interface goes into the err-disabled state.E、When a BPDU is received on a BPDU filtering enabled port， the interface goes into the err-disabled state.F、When a BPDU is received on a BPDU filtering enabled port， the interface goes into the STP blocking state.
Which three statements about STP timers are true？（）A、STP timers values （hello， forward delay， max age） are included in each BPDU.B、A switch is not concerned about its local configuration of the STP timers values. It will only consider the value of the STP timers contained in the BPDU it is receiving.C、To successfully exchange BPDUs between two switches， their STP timers value （hello， forward delay， max age） must be the same.D、If any STP timer value （hello， forward delay， max age） needs to be changed， it should at least be changed on the root bridge and backup root bridge.E、On a switched network with a small network diameter， the STP hello timer can be tuned to a lower value to decrease the load on the switch CPU.F、The root bridge passes the timer information in BPDUs to all routers in the Layer 3 configuration.
What is the purpose of the STP PortFast BPDU guard feature？ （）A、enforce the placement of the root bridge in the networkB、ensure that a port is transitioned to a forwarding state quickly if a BPDU is receivedC、enforce the borders of an STP domainD、ensure that any BPDUs received are forwarded into the STP domain
单选题Which statement correctly describes enabling BPDU guard on an access port that is also enabled for PortFast？（）AUpon startup， the port transmits 10 BPDUs. If the port receives a BPDU， PortFast and BPDU guard are disabled on that port and it assumes normal STP operation.BThe access port ignores any received BPDU.CIf the port receives a BPDU， it is placed into the error-disable state.DBPDU guard is only configured globally and the BPDU filter is required for port-level configuration.
单选题After configuring FabricPath， the following appears in the syslog： %STP-2-L2GW_BACKBONE_BLOCK： L2 Gateway Backbone port inconsistency blocking port port-channel100 on VLAN0010. What is the cause of this message？ （）A STP must be disabled； message indicates that STP is enabled.B STP is misconfigured； root guard must be disabled.C An inferior BPDU is received on a Cisco FabricPath edge port.D A superior BPDU is received on a Cisco FabricPath edge port.
单选题以下不属于生成树协议（STP）拓扑改变信息的报文是（）。A 拓扑改变通知 BPDU（Topology Change Notification BPDU）B 拓扑改变通知配置 BPDU（Topology Change Notification Configuration BPDU）C 拓扑改变确认配置 BPDU（Topology Change Acknowledge Configuration BPDU）D 拓扑改变配置 BPDU（Topology Change Configuration BPDU）
多选题在配置BPDU报文的格式上，除了保证和STP格式基本一致之外，RSTP作了一些小变化，以下描述正确的是（）AType字段，配置BPDU类型不再是0而是2B运行STP的设备收到RSTP的配置BPDU时会丢弃Cflags字段，使用了原来保留的中间6位，这样改变的配置BPDU叫做RSTBPDUD在flag字段中，Bito是TCA
单选题在STP协议中，配置信息是通过BPDU协议数据包来进行转发的，那么对于配置BPDU报文，以下说法正确的是（）A配置BPDU不能在指定端口上发送B配置BPDU只能在指定端口上发送C配置BPDU能够在任意角色的端口上发送D以上说法都不正确
多选题Which two statements are true about BPDU port-guard and BPDU filtering？（）ABPDU port-guard can be enabled globally， whereas BPDU filtering must be enabled on a per-interface basis.BWhen globally enabled， BPDU port-guard and BPDU filtering apply only to PortFast enabled ports.CWhen globally enabled， BPDU port-guard and BPDU filtering apply only to trunking-enabled ports.DWhen a BPDU is received on a BPDU port-guard enabled port， the interface goes into the err-disabled state.EWhen a BPDU is received on a BPDU filtering enabled port， the interface goes into the err-disabled state.FWhen a BPDU is received on a BPDU filtering enabled port， the interface goes into the STP blocking state.