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单选题
What is the purpose of the STP PortFast BPDU guard feature？ （）
A
enforce the placement of the root bridge in the network
B
ensure that a port is transitioned to a forwarding state quickly if a BPDU is received
C
enforce the borders of an STP domain
D
ensure that any BPDUs received are forwarded into the STP domain
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更多 “单选题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” 相关考题
考题
（ 20 ）提高 Catalyst 6500 发生间接链路失效的收敛速度，正确配置 STP 可选功能的命令是A ） set spantree backbonefast enableB ） set spantree uplinkfast enableC ） set spantree portfast 3/2 enableD ） set spantree portfast bpdu-filter enable
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 of the following characteristics describe the BPDU Guard feature（）A、ABPDU Guard port should only be configured on ports with PortFast enabled.B、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 port.D、ABPDU Guard port receiving a BPDU will go into err-disablestate.E、ABPDU Guard port receiving a BPDU will be disabled.F、BPDU Guard can be enabled on any switch port.
考题
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
Switch R1 has been configured with the root guard feature. What statement is true if the spanning tree enhancement Root Guard is enabled？ （）A、 If BPDUs are not received on a non-designated port， the port is moved into the STP loop- inconsistent blocked stateB、 IF BPDUs are received on a PortFast enabled port， the port is disabled.C、 If superior BPDUs are received on a designated port， the interface is placed into the root- inconsistent blocked state.D、 If inferior BPDUs are received on a root port， all blocked ports become alternate paths to the root bride.
考题
What is the STP root guard feature designed to prevent？（）A、a root port being transitioned to the blocking stateB、a port being assigned as a root portC、a port being assigned as an alternate portD、a root port being transitioned to the forwarding state
考题
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.
考题
Which two are natively included by the IEEE 802.1w standard？（）A、instances can control a selection of VLANsB、load balancingC、fast transition to forwarding stateD、backbone，uplink，and portfast （or equivalent）E、root，loop，and BPDU guard （or equivalent）
考题
The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？ （）A、BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network. B、BPDU guard can guarantee proper selection of the root bridge.C、BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.D、BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.E、None of the other alternatives apply
考题
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
考题
Which two statements correctly describe characteristics of the PortFast feature？ （）A、STP will be disabled on the port.B、PortFast can also be configured on trunk ports.C、PortFast is required to enable port-based BPDU guard.D、PortFast is used for both STP and RSTP host ports.E、PortFast is used for STP-only host ports.
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
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
The following was configured on a switch： Switch（config） # spanning-tree portfast bpdufilter default What is the effect of this configuration command？（）A、If BPDUs are received by a port configured for PortFast， they are ignored and none are sent.B、The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.C、If BPDUs are received by a port configured for Portfast， the port will transition to forwarding state.D、If BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally.E、None of the other alternatives apply.
考题
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
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
单选题提高Caralyst 6500发生直接链路失效的收敛速度，正确配置STP可选功能的命令是（ ）。A
set spantree backbonefast enableB
set spantree uplinkfast enableC
set spanttee portfast 3/2 enableD
set spantree portfast bpdu-filter enable
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.
考题
单选题What is the STP root guard feature designed to prevent？（）A
a root port being transitioned to the blocking stateB
a port being assigned as a root portC
a port being assigned as an alternate portD
a root port being transitioned to the forwarding state
考题
单选题Which spanning-tree command would cause a PortFast-enabled interface to lose its PortFast-operational status and disable BPDU filtering if it receives BPDUs？（）A
spanning-tree guard rootB
spanning-tree portfast bpduguard defaultC
spanning-tree bpduguard enableD
spanning-tree bpdufilter enableE
spanning-tree portfast bpdufilter default
考题
单选题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
多选题Which two statements correctly describe characteristics of the PortFast feature？ （）ASTP will be disabled on the port.BPortFast can also be configured on trunk ports.CPortFast is required to enable port-based BPDU guard.DPortFast is used for both STP and RSTP host ports.EPortFast is used for STP-only host ports.
考题
多选题Which of the following characteristics describe the BPDU Guard feature（）AABPDU Guard port should only be configured on ports with PortFast enabled.BBPDU 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 port.DABPDU Guard port receiving a BPDU will go into err-disablestate.EABPDU Guard port receiving a BPDU will be disabled.FBPDU Guard can be enabled on any switch port.
考题
多选题Which two are natively included by the IEEE 802.1w standard？（）Ainstances can control a selection of VLANsBload balancingCfast transition to forwarding stateDbackbone，uplink，and portfast （or equivalent）Eroot，loop，and BPDU guard （or equivalent）
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.
考题
单选题Switch R1 has been configured with the root guard feature. What statement is true if the spanning tree enhancement Root Guard is enabled？ （）A
If BPDUs are not received on a non-designated port， the port is moved into the STP loop- inconsistent blocked stateB
IF BPDUs are received on a PortFast enabled port， the port is disabled.C
If superior BPDUs are received on a designated port， the interface is placed into the root- inconsistent blocked state.D
If inferior BPDUs are received on a root port， all blocked ports become alternate paths to the root bride.
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