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 

题目
多选题
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 beencorrected

B

A Root Guard port receiving superior BPDU goes into a root-inconsistent state

C

A Root Guard port receiving inferior BPDU goes into a root-inconsistent state

D

While the port is in a root-inconsistent state no user data is sent across that port

E

The port returns to a forwarding state if inferior BPDUs stop

F

It should be applied to all switch ports

相似考题

1.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.

2. 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.

3.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

4.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

参考答案和解析
正确答案： C,B
解析： 暂无解析
更多“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 ”相关问题

  • 第1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.

    正确答案:D

  • 第2题：

    If a port configured with STP loop guard stops receiving BPDUs， the port will be put into which state？（）

    • A、learning state
    • B、listening state
    • C、forwarding state
    • D、root-inconsistent state

    正确答案:D

  • 第3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 beencorrected
    • B、A Root Guard port receiving superior BPDU goes into a root-inconsistent state
    • C、A Root Guard port receiving inferior BPDU goes into a root-inconsistent state
    • D、While the port is in a root-inconsistent state no user data is sent across that port
    • E、The port returns to a forwarding state if inferior BPDUs stop
    • F、It should be applied to all switch ports

    正确答案:B,D

  • 第4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

    正确答案:C

  • 第5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.

    正确答案:D

  • 第6题：

    多选题
    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 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

    A BPDU Guard port receiving a BPDU will go into err-disable state

    E

    A BPDU Guard port receiving a BPDU will be disabled

    F

    BPDU Guard can be enabled on any switch port


    正确答案： D,F
    解析： 暂无解析

  • 第7题：

    单选题
    As a network administrator， can you tell me what the root guard feature provides in a bridgednetwork？（）
    A

    It ensures that BPDUs sent by the root bridge are forwarded in a timely manner

    B

    It enforces the root bridge placement in the network

    C

    It ensures that all ports receiving BPDUs from the root bridge are in the forwarding state.

    D

    It ensures that the bridge is elected as root bridge in the network.


    正确答案： D
    解析： 暂无解析

  • 第8题：

    多选题
    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.


    正确答案： D,B
    解析： 暂无解析

  • 第9题：

    多选题
    After properly configuring multiple VLANs， an administrator has decided to secure its VLAN network. Which three steps are required to secure this environment？ （Choose three.）（）
    A

    If a port is connected to a foreign device make sure to disable CDP， DTP， RPR， PAgP， UDLP， and any other unnecessary protocols， and enable UplinkFast/BPDU guard on it.

    B

    Enable root guard feature to prevent a directly or indirectly connected STP-capable device from affecting the location of the root bridge.

    C

    Configure VTP domains appropriately or turn off VTP altogether to limit or prevent possible undesirable protocol interaction with regards to the network-wide VLAN configuration.

    D

    Set the native VLAN ID to match the port VLAN ID of any 802.1q trunk to prevent spoofing.

    E

    Disable all unused ports and place them in an unused VLAN to avoid unauthorized access.


    正确答案： D,E
    解析： 暂无解析

  • 第10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 state

    B

     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.


    正确答案： A
    解析： 暂无解析

  • 第11题：

    多选题
    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.


    正确答案： A,C
    解析： 暂无解析

  • 第12题：

    单选题
    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


    正确答案： B
    解析： 暂无解析

  • 第13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 Fast
    • B、Port Fast
    • C、BPDU Guard
    • D、Root Guard

    正确答案:C

  • 第14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.

    正确答案:C

  • 第15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.

    正确答案:B,D

  • 第16题：

    As a network administrator， can you tell me what the root guard feature provides in a bridgednetwork？（）

    • A、It ensures that BPDUs sent by the root bridge are forwarded in a timely manner
    • B、It enforces the root bridge placement in the network
    • C、It ensures that all ports receiving BPDUs from the root bridge are in the forwarding state.
    • D、It ensures that the bridge is elected as root bridge in the network.

    正确答案:B

  • 第17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.

    正确答案:B,F

  • 第18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.


    正确答案： D
    解析： 暂无解析

  • 第19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.


    正确答案： B
    解析： 暂无解析

  • 第20题：

    多选题
    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.


    正确答案： C,A
    解析： 暂无解析

  • 第21题：

    多选题
    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.


    正确答案： A,C
    解析： 暂无解析

  • 第22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.


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    If a port configured with STP loop guard stops receiving BPDUs，the port will be put into which state？（）
    A

    learning state

    B

    listening state

    C

    forwarding state

    D

    root-inconsistent state


    正确答案： D
    解析： 暂无解析

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