单选题If the root bridge fails, configuration BPDUs will no longer be sent. Which STP timer will have toexpire before the other switches can actively restore connectivity with topology change procedureof STP?()A hello timerB BPDU timerC Forward_delay timerD

题目
单选题
If the root bridge fails, configuration BPDUs will no longer be sent. Which STP timer will have toexpire before the other switches can actively restore connectivity with topology change procedureof STP?()
A

hello timer

B

BPDU timer

C

Forward_delay timer

D

Max_age timer

E

Dead timer

F

Wait timer


相似考题
参考答案和解析
正确答案: C
解析: 暂无解析
更多“If the root bridge fails, configuration BPDUs will no longer”相关问题
  • 第1题:

    Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree ProtocolIEEE 802.1 D?()

    • A、Designated Root Cost
    • B、bridge ID priority
    • C、max age
    • D、bridge ID MAC address
    • E、Designated Root Priority
    • F、forward delay

    正确答案:B,D

  • 第2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

    正确答案:D

  • 第3题:

    Which three options are considered in the spanning-tree decision process?()

    • A、lowest root bridge ID
    • B、lowest path cost to root bridge
    • C、lowest sender bridge ID
    • D、highest port ID
    • E、highest root bridge ID
    • F、highest path cost to root bridge

    正确答案:A,B,C

  • 第4题:

    Which two are effects of connecting a network segment that is running 802.1D to a network  segment that is running 802.1w?()

    • A、the entire network switches to 802.1D and generates BPDUs to determine root bridfe status.
    • B、A migration delay of three seconds occurs when the port that is connected to the 802.1D bridge comes up
    • C、The entire network reconverges and a unique root briddge for the 802.1D segment, and a root bridge for the 802.1W segment, is chosen
    • D、the first hop 802.1w switch that is connected to the 802.1D runs entirely in 802.1DCompatibility mode and converts the BPDUs to either 802.1D or 802.1W segments of the network
    • E、Classic 802.1D timers, Such as forward Delay and Max-age, will only be used as a backup, and will not be necessary if point-to-point links and edge prots are properly identified and set by the administrator.

    正确答案:B,D

  • 第5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6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: C
    解析: 暂无解析

  • 第8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9题:

    单选题
    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 cost

    B

    lowest root path cost;lowest root bridge id;lowest sender bridge id;lowest sender port id

    C

    lowest root bridge id;lowest sender bridge id;lowest root path cost;lowest sender port id

    D

    lowest root bridge id;lowest root path cost;lowest sender bridge id;lowest sender port id


    正确答案: D
    解析: 暂无解析

  • 第10题:

    单选题
    Which of the following settings will reduce packet overhead and overall latency in a standalonepoint-to-point bridge deployment?()
    A

    enable concatenation on the non-root bridge only

    B

    enable concatenation on the root bridge only

    C

    enable concatenation on both the root bridge and non-root bridge

    D

    enable concatenation on the root bridge and set it as desirable on the non-root bridge

    E

    set concatenation as desirable on the root bridge and enable it on the non-root bridge


    正确答案: C
    解析: 暂无解析

  • 第11题:

    多选题
    Which three statements about STP timers are true?()
    A

    STP timers values (hello, forward delay, max age) are included in each BPDU.

    B

    A switch is not concerned about its local configuration of the STP timers values. It will only consider the value of the STP timers contained in the BPDU it is receiving.

    C

    To successfully exchange BPDUs between two switches, their STP timers value (hello, forward delay, max age) must be the same.

    D

    If any STP timer value (hello, forward delay, max age) needs to be changed, it should at least be changed on the root bridge and backup root bridge.

    E

    On a switched network with a small network diameter, the STP hello timer can be tuned to a lower value to decrease the load on the switch CPU.

    F

    The root bridge passes the timer information in BPDUs to all routers in the Layer 3 configuration.


    正确答案: E,B
    解析: 暂无解析

  • 第12题:

    单选题
    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


    正确答案: D
    解析: 暂无解析

  • 第13题:

    If the root bridge fails, configuration BPDUs will no longer be sent. Which STP timer will have toexpire before the other switches can actively restore connectivity with topology change procedureof STP?()

    • A、hello timer
    • B、BPDU timer
    • C、Forward_delay timer
    • D、Max_age timer
    • E、Dead timer
    • F、Wait timer

    正确答案:D

  • 第14题:

    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 cost
    • B、 1) lowest root path cost,2)lowest root bridge id,3)lowest sender bridge id,4)lowest sender port id
    • C、 1) lowest root bridge id,2)lowest sender bridge id,3)lowest root path cost 4)owest sender port id
    • D、 1) lowest root bridge id,2)lowest root path cost,3)lowest sender bridge id,4)lowest sender port id

    正确答案:D

  • 第15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 port
    • B、backup port
    • C、designated port
    • D、alternate port

    正确答案:A

  • 第16题:

    Which three statements about STP timers are true?()

    • A、STP timers values (hello, forward delay, max age) are included in each BPDU.
    • B、A switch is not concerned about its local configuration of the STP timers values. It will only consider the value of the STP timers contained in the BPDU it is receiving.
    • C、To successfully exchange BPDUs between two switches, their STP timers value (hello, forward delay, max age) must be the same.
    • D、If any STP timer value (hello, forward delay, max age) needs to be changed, it should at least be changed on the root bridge and backup root bridge.
    • E、On a switched network with a small network diameter, the STP hello timer can be tuned to a lower value to decrease the load on the switch CPU.
    • F、The root bridge passes the timer information in BPDUs to all routers in the Layer 3 configuration.

    正确答案:A,B,D

  • 第17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18题:

    单选题
    Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D? ()
    A

     802.1D bridges do not relay BPDUs.

    B

     802.1w bridges do not relay BPDUs.

    C

     802.1D bridges only relay BPDUs received from the root.

    D

     802.1w bridges only relay BPDUs received from the root.


    正确答案: C
    解析: 暂无解析

  • 第19题:

    多选题
    Which three options are considered in the spanning-tree decision process?()
    A

    lowest root bridge ID

    B

    lowest path cost to root bridge

    C

    lowest sender bridge ID

    D

    highest port ID

    E

    highest root bridge ID

    F

    highest path cost to root bridge


    正确答案: A,D
    解析: 暂无解析

  • 第20题:

    单选题
    Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D?()
    A

    802.1D bridges do not relay BPDUs.

    B

    802.1w bridges do not relay BPDUs.

    C

    802.1D bridges only relay BPDUs received from the root.

    D

    802.1w bridges only relay BPDUs received from the root.


    正确答案: A
    解析: 暂无解析

  • 第21题:

    单选题
    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 cost

    B

     1) lowest root path cost,2)lowest root bridge id,3)lowest sender bridge id,4)lowest sender port id

    C

     1) lowest root bridge id,2)lowest sender bridge id,3)lowest root path cost 4)owest sender port id

    D

     1) lowest root bridge id,2)lowest root path cost,3)lowest sender bridge id,4)lowest sender port id


    正确答案: A
    解析: 暂无解析

  • 第22题:

    单选题
    Which of the following settings will reduce packet overhead and overall latency in a standalone point-to-point bridge deployment?()
    A

    enable concatenation on the non-root bridge only

    B

    enable concatenation on the root bridge only

    C

    enable concatenation on both the root bridge and non-root bridge

    D

    enable concatenation on the root bridge and set it as desirable on the non-root bridge

    E

    set concatenation as desirable on the root bridge and enable it on the non-root bridge


    正确答案: E
    解析: 暂无解析

  • 第23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