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What is the STP root guard feature designed to prevent？（）
- A、a root port being transitioned to the blocking state
- B、a port being assigned as a root port
- C、a port being assigned as an alternate port
- D、a root port being transitioned to the forwarding state
参考答案
更多 “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” 相关考题
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After the SSP being checked by a duly authorized officials of a port State, whom should be reported to by the ship immediately?A.Port StateB.Flag stateC.The CSOD.The Administration
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What are the switch and bridge port characteristics of a layer two spanning－tree network that is fully converged?()
A. All switch and bridge ports are in the forwarding state.B. All switch and bridge ports are in the stand-by state.C. All switch and bridge ports are assigned as either root or designated ports.D. All switch and bridge ports are in either the forwarding or blocking state.E. All switch and bridge are either blocking or looping.
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在RSTP协议中定义了与STP中不同的端口角色,其中不能处于转发状态的端口角色的是()
A.Root PortB.Designated PortC.Backup PortD.Alternate Port
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Which of the following three port types are valid Spanning Tree port types？（Choose the best threeanswers.）（）A、Designated portB、Nonswitch portC、Switch portD、Nonroot portE、Nondesignated portF、Root port
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IEEE 802.1w is a Rapid Spanning Tree Protocol （RSTP） that can be seen as an evolution of the 802.1 standard. What are the port roles described by 802.1w？（）A、root port，designated port，alternate port，backup port，and disabledB、standby port，alternate port，root port，and disabledC、standby port，designated port，backup port，and disabledD、root port，designated port，alternate port，and standby 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.
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Which port role has interface Fa0/2 of switch 1 adopted for VLAN 47？（）A、Root portB、Nondesigned portC、Designated portD、Backup portE、Alternate portF、None of the other alternatives apply
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Which two statements best describe spanning-tree BPDU processing for a blocking port？（）A、BPDUs that enter a blocking port are discarded.B、BPDUs that enter a blocking port are processed.C、Loopguard puts an interface into a loop-inconsistent state when BPDUs stop being received on a blocking port.D、BPDUs are only processed on forwarding ports.
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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.
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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
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What value is primarily used to determine which port becomes the root port on each non root switch in a spanning-tree topology?（）A、path costB、lowest port MAC addressC、VTP revision numberD、highest port priority numberE、port priority number and MAC address
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If a port configured with STP loop guard stops receiving BPDUs， the port will be put into which state？（）A、learning stateB、listening stateC、forwarding stateD、root-inconsistent state
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以下关于生成树协议的端口角色的描述不正确的是？（）A、生成树协议（STP）的端口角色有根端口（Root Port），指定端口（Designated Port）和备份端口（BackupPort）；快速生成树协议（RSTP）的端口角色有根端口（Root Port）、指定端口（Designated Port），备份端口（Backup Port）和预备端口（Alternate Port）。B、生成树协议（STP）的端口角色有根端口（Root Port），指定端口（Designated Port）和预备端口（AlternatePort）；快速生成树协议（RSTP）的端口角色有根端口（Root Port）、指定端口（Designated Port），备份端口（Backup Port）和预备端口（Alternate Port）。C、预备端口（Alternate Port）所属交换机是该端口所连接的网段的指定交换机。D、备份端口（Backup Port）所属交换机不是该端口所连接的网段的指定交换机，是RSTP特有的端口角色。
考题
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
考题
Please match the Cisco STP enahancement term to its definition.（） (1) BPDU guard (2) PortFast (3) BackboneFast (4) Loop guard (5) Root guard (a) shuts down a port that receives a BPDU when enabled (b) cuts convergence time by mas-age for indirect failure (c) prevents the aliernate or root port from being designated in absence of BPDUs (d )causes Layer 2 LAN interface access port to immediately enter the forwarding state (e) helps prevent bridging loops due to jni-directional link failures on point-to-point linksA、（a）-（1）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（3）B、（a）-（4）；（b）-（3）；（c）-（2）；（d）-（5）；（e）-（1）C、（a）-（3）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（1）D、（a）-（1）；（b）-（3）；（c）-（4）；（d）-（2）；（e）-（4）
考题
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
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
Which statement is correct about RSTP port roles？（）A、The designated port is the switch port on every nonroot bridge that is the chosen path to theroot bridge. There can be only one designated port on every switch. The designated portassumes the forwarding state in a stable active topology. All switches connected to a given segment listen to all BPDUs and determine the switch that will be the root switch for a particular segment.B、The disabled port is an additional switch port on the designated switch with a redundant link to the segment for which the switch is designated. A disabled port has a higher port ID than the disabled port on the designated switch. The disabled port assumes the discarding state in astable active topology.C、The backup port is a switch port that offers an alternate path toward the root bridge. The backup port assumes a discarding state in a stable， active topology. The backup port will be present on nondesignated switches and will make a transition to a designated port if the current designated path fails.D、The root port is the switch port on every nonroot bridge that is the chosen path to the root bridge. There can be only one root port on every switch. The root port assumes the forwarding state in a stable active topology.
考题
Which two statements concerning STP state changes are true？ （）A、Upon bootup，a port transitions from blocking to forwarding because it assumes itself as root.B、Upon bootup，a port transitions from blocking to listening because it assumes itself as root.C、Upon bootup，a port transitions from listening to forwarding because it assumes itself as root.D、If a forwarding port receives no BPDUs by the max_age time limit， it will transition to listening.E、If a forwarding port receives an inferior BPDU， it will transition to listening.F、If a blocked port receives no BPDUs by the max_age time limit， it will transition to listening.
考题
单选题IEEE 802.1w is a Rapid Spanning Tree Protocol （RSTP） that can be seen as an evolution of the 802.1 standard. What are the port roles described by 802.1w？（）A
root port，designated port，alternate port，backup port，and disabledB
standby port，alternate port，root port，and disabledC
standby port，designated port，backup port，and disabledD
root port，designated port，alternate port，and standby port
考题
单选题Which statement is correct about RSTP port roles？（）A
The designated port is the switch port on every nonroot bridge that is the chosen path to theroot bridge. There can be only one designated port on every switch. The designated portassumes the forwarding state in a stable active topology. All switches connected to a given segment listen to all BPDUs and determine the switch that will be the root switch for a particular segment.B
The disabled port is an additional switch port on the designated switch with a redundant link to the segment for which the switch is designated. A disabled port has a higher port ID than the disabled port on the designated switch. The disabled port assumes the discarding state in astable active topology.C
The backup port is a switch port that offers an alternate path toward the root bridge. The backup port assumes a discarding state in a stable， active topology. The backup port will be present on nondesignated switches and will make a transition to a designated port if the current designated path fails.D
The root port is the switch port on every nonroot bridge that is the chosen path to the root bridge. There can be only one root port on every switch. The root port assumes the forwarding state in a stable active topology.
考题
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
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.
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 value is primarily used to determine which port becomes the root port on each non root switch in a spanning-tree topology?（）A
path costB
lowest port MAC addressC
VTP revision numberD
highest port priority numberE
port priority number and MAC address
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
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