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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 disabled
B
standby port，alternate port，root port，and disabled
C
standby port，designated port，backup port，and disabled
D
root port，designated port，alternate port，and standby 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
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What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）A、lowest port MAC addressB、port priority number and MAC addressC、VTP revision numberD、highest port priority numberE、path cost
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
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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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What will occur when a nonedge switch port that is configured for Rapid Spanning Tree does not receive a BPDU from its neighbor for three consecutive hello time intervals？（）A、RSTP information is automatically aged out.B、The port sends a TCN to the root bridge.C、The port moves to listening state.D、The port becomes a normal spanning tree port.
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考题
Which three port states are used by RSTP 802.1w？（）A、ListeningB、LearningC、ForwardingD、BlockingE、DiscardingF、Disabled
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 value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?（）A、lowest port MAC addressB、port priority number and MAC address.C、VTP revision numberD、highest port priority number.E、path cost
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
单选题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
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
单选题What will occur when a nonedge switch port that is configured for Rapid Spanning Tree does not receive a BPDU from its neighbor for three consecutive hello time intervals？（）A
RSTP information is automatically aged out.B
The port sends a TCN to the root bridge.C
The port moves to listening state.D
The port becomes a normal spanning tree port.
考题
单选题What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?（）A
lowest port MAC addressB
port priority number and MAC address.C
VTP revision numberD
highest port priority number.E
path cost
考题
多选题Which three port states are used by RSTP 802.1w？（）AListeningBLearningCForwardingDBlockingEDiscardingFDisabled
考题
单选题What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）A
lowest port MAC addressB
port priority number and MAC addressC
VTP revision numberD
highest port priority numberE
path cost
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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