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单选题
BPDU防护依赖下列哪种特性（）.
A
portfast
B
BPDU过滤
C
UPlinkfast
D
根防护
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BPDU防护有何用途?()
A.确保端口从正确的上游交换机那里收到了BPDUB.禁止端口接收来自上游交换机的BPDU，而只接收来自根交换机的BPDUC.可在启用了BPDU防护的端口上使用PortFast，在端口收到BPDU时将其关闭D.在端口收到BPDU时将其关闭
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下列对网桥协议数据单元（BPDU）的描述中，错误的是（ ）。A.生成树中树状结构的生成，主要依靠BPDU提供的信息B.生成树中阻塞端口只能接收和读取BPDU，不能接收和转发数据流C.BPDU的BridgeID中优先级的取值范围是0-61440，增值量是4096D.配置BPDU数据包不超过32个字节，拓扑变化通知BPDU数据包不超过4个字节
考题
Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?()
A.BackboneFastB.UplinkFastC.Root GuardD.BPDU GuardE.BPDU Filter
考题
在同一端口上启用了BPDU防护和BPDU过滤，以下描述正确的是（）A、BPDU防护生效，BPDU过滤失效B、BPDU防护失效，BPDU过滤生效C、BPDU防护和BPDU过滤同时生效D、BPDU防护和BPDU过滤冲突，都失效
考题
关于spanning-treeportfast说法正确的是（）A、不发送BPDU，但接受BPDU，一旦接收到BPDU后，就开始恢复生成树的转发延迟等特性B、发送BPDU，接受BPDU，一旦接收到BPDU后，会进行生成树协议计算C、发送BPDU，不接受BPDUD、即不发送BPDU，也不接受BPDU，因为portfast表明了所连接的接口是主机端口，没有必要发送和接收BPDU
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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
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Which of the following characteristics describe the BPDU Guard feature？（Choose all that apply.）（）A、A BPDU Guard port should only be configured on ports with PortFast enabledB、BPDU Guard and PortFast should not be enabled on the same port.C、BPDU Guard is used to ensure that superior BPDUs are not received on a switch portD、A BPDU Guard port receiving a BPDU will go into err-disable stateE、A BPDU Guard port receiving a BPDU will be disabledF、BPDU Guard can be enabled on any switch port
考题
下面哪项交换机的功能能实现关闭正在接受BPDU且配置了PortFast接口？（）A、 BackboneFastB、 UplinkFastC、 Root GuardD、 BPDU GuardE、 BPDU Filter
考题
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.
考题
关于BPDU保护，以下说法正确的有（）。A、没有配置BPDU保护的边缘端口收到BPDU会转变为非边缘端口B、BPDU保护在被保护的端口视图配置C、BPDU保护在系统视图配置D、配置BPDU保护后，边缘端口收到BPDU会被关闭
考题
关于配置BPDU和TCN BPDU，说法正确的有（）。A、配置BPDU仅从指定端口发出，TCN BPDU仅从根端口发出B、配置BPDU通常仅由根桥周期性发出，TCN BPDU除根桥外其他网桥都可能发出C、配置BPDU通常仅从根端口接收，TCN BPDU仅从指定端口接收D、AIternate端口既不会发送配置BPDU也不会发送TCN BPDU
考题
Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）A、BackboneFastB、UplinkFastC、Root GuardD、BPDU GuardE、BPDU Filter
考题
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.
考题
多选题Which of the following characteristics describe the BPDU Guard feature？（Choose all that apply.）（）AA BPDU Guard port should only be configured on ports with PortFast enabledBBPDU Guard and PortFast should not be enabled on the same port.CBPDU Guard is used to ensure that superior BPDUs are not received on a switch portDA BPDU Guard port receiving a BPDU will go into err-disable stateEA BPDU Guard port receiving a BPDU will be disabledFBPDU Guard can be enabled on any switch port
考题
单选题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.
考题
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）
考题
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.
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