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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
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更多 “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” 相关考题
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.
考题
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
考题
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.
考题
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
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
考题
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 FastB、Port FastC、BPDU GuardD、Root Guard
考题
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.
考题
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
考题
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.
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
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、GLBPB、RSTPC、BPDU guardD、root guard
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
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
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 mannerB、It enforces the root bridge placement in the networkC、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.
考题
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.
考题
What two features in Cisco switches help prevent Layer 2 loops？（）A、UniDirectional Link DetectionB、Hot Standby Router ProtocolC、Virtual Router Redundancy ProtocolD、PortFastE、root guardF、loop guard
考题
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.
考题
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 mannerB
It enforces the root bridge placement in the networkC
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.
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
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？ （）ALoop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannotBUDLD protects against STP failures caused by cabling problems that create one-way links.CLoop guard detects and protects against duplicate packets being received and transmitted on different portsDUDLD protects against unidirectional cabling problems on copper and fiber media.ELoop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.
考题
多选题What two features in Cisco switches help prevent Layer 2 loops？（）AUniDirectional Link DetectionBHot Standby Router ProtocolCVirtual Router Redundancy ProtocolDPortFastEroot guardFloop guard
考题
单选题Which configuration is used to enable root guard？（）A
interface gig3/1 spanning-tree guard rootB
interface gig3/1 spanning-tree root guardC
interface gig3/1 spanning-tree root-guardD
interface gig3/1 spanning-tree root-guard default
考题
单选题You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network，you experienced network problems because you reconnected wrong fibers to wrong ports. What could you do to prevent this type of problem in the future，particularly when connecting and reconnecting fiber pairs？（）A
Only use fiber in pairs.B
Configure root guard on your switches.C
Do not use fiber but use copper.D
Configure UDLD to prevent one-way link conditions.
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
多选题Which two statements correctly describe characteristics of the PortFast feature？ （）ASTP will be disabled on the port.BPortFast can also be configured on trunk ports.CPortFast is required to enable port-based BPDU guard.DPortFast is used for both STP and RSTP host ports.EPortFast is used for STP-only host 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
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