Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？ （）A、 Loop guard can be used with root guard simultaneously on the same port on the sa

题目

Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？ （）

  • A、 Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot
  • B、 UDLD protects against STP failures caused by cabling problems that create one-way links.
  • C、 Loop guard detects and protects against duplicate packets being received and transmitted on different ports
  • D、 UDLD protects against unidirectional cabling problems on copper and fiber media.
  • E、 Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.
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.In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops can cause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limit excessive traffic during spanning-tree loop conditions？ （）A、loop guardB、storm controlC、storm suppressionD、broadcast suppressionE、BPDU guard

3.The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "zero." （）A、loop guardB、storm controlC、storm suppressionD、broadcast suppressionE、BPDU guard

4. 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.

参考答案和解析
正确答案:B,E
更多“Loop guard and ”相关问题

  • 第1题：

    Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）

    • A、Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.
    • B、UDLD protects against STP failures caused by cabling problems that create one-way links.
    • C、Loop guard detects and protects against duplicate packets being received and transmitted on different ports.
    • D、UDLD protects against unidirectional cabling problems on copper and fiber media.
    • E、Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

    正确答案:B,E

  • 第2题：

    What is the result of entering the command spanning-tree loopguard default？（）

    • A、The command enables both loop guard and root guard.
    • B、The command changes the status of loop guard from the default of disabled to enabled.
    • C、The command activates loop guard on point-to-multipoint links in the switched network.
    • D、The command will disable EtherChannel guard.

    正确答案:B

  • 第3题：

    在Mako模板中，for结构通过loop对象可获取循环的额外信息，以下哪些是loop对象中可获取到的属性（）

    • A、loop.index
    • B、loop.len
    • C、loop.odd
    • D、loop.even

    正确答案:A,C,D

  • 第4题：

    As an experienced network engineer, you are asked to troubleshoot a CIS network outage. During the troubleshooting process, you notice that one of your colleagues connects additional devices to the network with the use of his own switch. With the purpose of improving speed, the switch is attached to both network ports in an office, which leads to bridge loop. Enabling which of the following feature will be able to prevent this problem from happening again?（）

    • A、GLBP
    • B、RSTP
    • C、BPDU guard
    • D、root guard

    正确答案:C

  • 第5题：

    What two features in Cisco switches help prevent Layer 2 loops？（）

    • A、UniDirectional Link Detection
    • B、Hot Standby Router Protocol
    • C、Virtual Router Redundancy Protocol
    • D、PortFast
    • E、root guard
    • F、loop guard

    正确答案:A,F

  • 第6题：

    下列关于APU火警探测说法正确的是（）

    • A、LOOP A探测到火警同时LOOP B 失效
    • B、LOOP B探测到火警同时LOOP A 失效
    • C、C、LOOP LOOP B 在5秒之内均失效
    • D、以上答案均正确

    正确答案:D

  • 第7题：

    单选题
    What is the result of entering the command spanning-tree loopguard default？（）
    A

    The command enables both loop guard and root guard.

    B

    The command changes the status of loop guard from the default of disabled to enabled.

    C

    The command activates loop guard on point-to-multipoint links in the switched network.

    D

    The command will disable EtherChannel guard.


    正确答案： C
    解析： 暂无解析

  • 第8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： B
    解析： 暂无解析

  • 第9题：

    多选题
    Which two statements correctly describe UDLD？ （）
    A

    Unidirectional link detection is achieved through monitoring STP BPDUs.

    B

    It is recommended that it be enabled globally rather than on an individual port.

    C

    When an error is detected， normal mode will disable a port.

    D

    It is recommended that it be enabled in normal mode.

    E

    It is recommended that it be used with the loop guard feature.


    正确答案： D,A
    解析： 暂无解析

  • 第10题：

    多选题
    In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops can cause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limit excessive traffic during spanning-tree loop conditions？ （）
    A

    loop guard

    B

    storm control

    C

    storm suppression

    D

    broadcast suppression

    E

    BPDU guard


    正确答案： B,C
    解析： 暂无解析

  • 第11题：

    多选题
    Which two are natively included by the IEEE 802.1w standard？（）
    A

    instances can control a selection of VLANs

    B

    load balancing

    C

    fast transition to forwarding state

    D

    backbone，uplink，and portfast （or equivalent）

    E

    root，loop，and BPDU guard （or equivalent）


    正确答案： B,A
    解析： 暂无解析

  • 第12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13题：

    Which two are natively included by the IEEE 802.1w standard？（）

    • A、instances can control a selection of VLANs
    • B、load balancing
    • C、fast transition to forwarding state
    • D、backbone，uplink，and portfast （or equivalent）
    • E、root，loop，and BPDU guard （or equivalent）

    正确答案:C,D

  • 第14题：

    Which statement is true about loop guard？（）

    • A、Loop guard only operates on interfaces that are considered point-to-point by the spanning tree.
    • B、Loop guard only operates on root ports.
    • C、Loop guard only operates on designated ports.
    • D、Loop guard only operates on edge ports.

    正确答案:A

  • 第15题：

    下列关于do while…loop和do…loop until循环执行循环体次数的描述正确的是（）。

    • A、do while…loop循环和do…loop until循环至少都执行一次
    • B、do while…loop循环和do…loop until循环可能都不执行
    • C、do while…loop循环至少执行一次，do…loop until循环可能不执行
    • D、do while…loop循环可能不执行，do…loop until循环至少执行一次

    正确答案:D

  • 第16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 links

    • A、（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）

    正确答案:D

  • 第17题：

    In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops cancause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limitexcessive traffic during spanning-tree loop conditions？（）

    • A、loop guard
    • B、storm control
    • C、storm suppression
    • D、broadcast suppression
    • E、BPDU guard

    正确答案:B,D

  • 第18题：

    多选题
    Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）
    A

    Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.

    B

    UDLD protects against STP failures caused by cabling problems that create one-way links.

    C

    Loop guard detects and protects against duplicate packets being received and transmitted on different ports.

    D

    UDLD protects against unidirectional cabling problems on copper and fiber media.

    E

    Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.


    正确答案： E,D
    解析： 暂无解析

  • 第19题：

    单选题
    Which statement is true about loop guard？（）
    A

    Loop guard only operates on interfaces that are considered point-to-point by the spanning tree.

    B

    Loop guard only operates on root ports.

    C

    Loop guard only operates on designated ports.

    D

    Loop guard only operates on edge ports.


    正确答案： C
    解析： 暂无解析

  • 第20题：

    多选题
    Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？ （）
    A

    Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot

    B

    UDLD protects against STP failures caused by cabling problems that create one-way links.

    C

    Loop guard detects and protects against duplicate packets being received and transmitted on different ports

    D

    UDLD protects against unidirectional cabling problems on copper and fiber media.

    E

    Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.


    正确答案： D,E
    解析： 暂无解析

  • 第21题：

    单选题
    Which of the following commands can be issued without interfering with the operation of loop guard？（）
    A

    Switch（config-if）#spanning-tree guard root

    B

    Switch（config-if）#spanning-tree portfast

    C

    Switch（config-if）#switchport mode trunk

    D

    Switch（config-if）#switchport mode access


    正确答案： C
    解析： 暂无解析

  • 第22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,B
    解析： 暂无解析

  • 第23题：

    多选题
    In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops cancause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limitexcessive traffic during spanning-tree loop conditions？（）
    A

    loop guard

    B

    storm control

    C

    storm suppression

    D

    broadcast suppression

    E

    BPDU guard


    正确答案： E,B
    解析： 暂无解析

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