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
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 Fast
- B、Port Fast
- C、BPDU Guard
- D、Root Guard
相关考题：
Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per－VLAN Spanning－Tree plus?() A. PortFastB. UplinkFastC. loop guardD. root guardE. BPDU guardF. BackboneFast
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
Examinethefollowingoptions,whichSpanningTreeProtocol(STP)protectionmechanismdisablesaswitchportiftheportreceivesaBridgeProtocolDataUnit(BPDU)?() A.Uplink FastB.Port FastC.BPDUGuardD.RootGuard
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.
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
Which four Cisco priority Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning Tree？ （）A、 PortFastB、 UplinkFastC、 loop guardD、 root guardE、 BPDU guardF、 BackboneFast
The classic Spanning Tree Protocol （802.1D 1998） uses which sequence of variables to determine the best received BPDU？（）A、lowest root bridge id；lowest sender bridge id；lowest port id；lowest root path costB、lowest root path cost；lowest root bridge id；lowest sender bridge id；lowest sender port idC、lowest root bridge id；lowest sender bridge id；lowest root path cost；lowest sender port idD、lowest root bridge id；lowest root path cost；lowest sender bridge id；lowest sender port id
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
What will occur when a nonedge switch port that is configured for Rapid Spanning Tree does not receive a BPDU from its neighbor for three consecutive hello time intervals？（）A、RSTP information is automatically aged out.B、The port sends a TCN to the root bridge.C、The port moves to listening state.D、The port becomes a normal spanning tree port.
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.
What Cisco technology protects against Spanning-Tree Protocol manipulation？（）A、 Spanning tree protectB、 Root Guard and BPDU GuardC、 Unicast Reverse Path ForwardingD、 MAC spoof guardE、 Port Security
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
The classic Spanning Tree Protocol （802.1D 1998） uses which sequence of variables to determine the best received BPDU？（）A、 1） lowest root bridge id，2）lowest sender bridge id，3）lowest port id，4）lowest root path costB、 1） lowest root path cost，2）lowest root bridge id，3）lowest sender bridge id，4）lowest sender port idC、 1） lowest root bridge id，2）lowest sender bridge id，3）lowest root path cost 4）owest sender port idD、 1） lowest root bridge id，2）lowest root path cost，3）lowest sender bridge id，4）lowest sender port id
Which of the following characteristics describe the Root Guard feature？（Choose all that apply.）（）A、The port must be put into forwarding state manually after root-inconsistent state has beencorrectedB、A Root Guard port receiving superior BPDU goes into a root-inconsistent stateC、A Root Guard port receiving inferior BPDU goes into a root-inconsistent stateD、While the port is in a root-inconsistent state no user data is sent across that portE、The port returns to a forwarding state if inferior BPDUs stopF、It should be applied to all switch ports
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.
For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）A、root portB、backup portC、designated portD、alternate port
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
Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning-Tree plus?（）A、PortFastB、UplinkFastC、loop guardD、root guardE、BPDU guardF、BackboneFast
单选题For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）Aroot portBbackup portCdesignated portDalternate port
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
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What Cisco technology protects against Spanning-Tree Protocol manipulation？（）A Spanning tree protectB Root Guard and BPDU GuardC Unicast Reverse Path ForwardingD MAC spoof guardE Port Security
单选题What will occur when a nonedge switch port that is configured for Rapid Spanning Tree does not receive a BPDU from its neighbor for three consecutive hello time intervals？（）ARSTP information is automatically aged out.BThe port sends a TCN to the root bridge.CThe port moves to listening state.DThe port becomes a normal spanning tree port.
多选题Which of the following characteristics describe the Root Guard feature？（Choose all that apply.）（）AThe port must be put into forwarding state manually after root-inconsistent state has beencorrectedBA Root Guard port receiving superior BPDU goes into a root-inconsistent stateCA Root Guard port receiving inferior BPDU goes into a root-inconsistent stateDWhile the port is in a root-inconsistent state no user data is sent across that portEThe port returns to a forwarding state if inferior BPDUs stopFIt should be applied to all switch ports
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.
单选题The classic Spanning Tree Protocol （802.1 D 1998） uses which sequence of variables to determine thebest received BPDU？（）A1） lowest root bridge id，2） lowest sender bridge id，3） lowest port id，4） lowest root path costB1） lowest root path cost，2） lowest root bridge id，3） lowest sender bridge id，4） lowest sender port idC1） lowest root bridge id，2） lowest sender bridge id，3） lowest root path cost，4） lowest sender port idD1） lowest root bridge id，2） lowest root path cost，3） lowest sender bridge id，4） lowest sender port id
单选题Examine the following options，which Spanning Tree Protocol （STP） protection mechanism disables aswitch port if the port receives a Bridge Protocol Data Unit （BPDU）？（）AUplink FastBPort FastCBPDU GuardDRoot Guard