单选题A port in a redundant topology is currently in the blocking state and is not receiving BPDUs. To ensure that this port does not erroneously transition to the forwarding state， which command should be configured to satisfy the requirement？（）A Switch（config）#spanning-tree loopguard defaultB Switch（config-if）#spanning-tree bdpufilterC Switch（config）#udld aggressiveD Switch（config-if）#spanning-tree bpduguard

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. path costB. lowest port MAC addressC. VTP revision numberD. highest port priority numberE. port priority number and MAC addressF. None of the above

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考题 Which of the following is the BEST way to allow web software through the server firewall?() A. Implement an application exception.B. Implement an access control list (ACL).C. Open the corporate firewall to allow port 80.D. Implement port blocking on port 80.

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考题 Which three statements about RSTP are true?() A. RSTP significantly reduces topology reconverging time after a link failure.B. RSTP expends the STP port roles by adding the alternate and backup roles.C. RSTP port atates are blocking,discarding,learing,or forwarding.D. RSTP also uses the STP proprsal-agreement sequence.E. RSTP use the same timer-baseed process as STP on point-to-point links.F. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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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 addressC、VTP revision numberD、highest port priority numberE、path cost

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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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考题 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

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考题 Which of the following will generate an RSTP topology change notification？（）A、 an edge port that transitions to the forwarding stateB、 a non-edge port that transitions to the blocking stateC、 a non-edge port that transitions to the forwarding stateD、 an edge port that transitions to the blocking stateE、 any port that transitions to the blocking stateF、 any port that transitions to the forwarding state

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考题 What two things will occur when an edge port receives a BPDU？（）A、The port immediately transitions to the Forwarding state.B、The switch generates a Topology Change Notification （TCN） BPDU.C、The port immediately transitions to the err-disable state.D、The port becomes a normal STP switch port.

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考题 Which two RSTP port roles include the port as part of the active topology？（）A、rootB、designatedC、alternateD、backupE、forwardingF、learning

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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

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考题 Which three statements about RSTP are true？（）A、RSTP significantly reduces topology reconverging time after a link failure.B、RSTP expends the STP port roles by adding the alternate and backup roles.C、RSTP port states are blocking，discarding，learing，or forwarding.D、RSTP also uses the STP proprsal-agreement sequence.E、RSTP use the same timer-baseed process as STP on point-to-point links.F、RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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考题 While deploying a new switch， you accidently connect ports 3/12 and 3/18 together， creating a loop. STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？（）A、 Port 3/12 was already up and forwarding before the loop was created.B、 Port priority is based on lowest priority and lowest port number.C、 You connected the wire on port 3/18 last.D、 None of the above， it is purely random.

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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.

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考题 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.

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考题 Which of the following is the BEST way to allow web software through the server firewall?（）A、Implement an application exception.B、Implement an access control list (ACL).C、Open the corporate firewall to allow port 80.D、Implement port blocking on port 80.

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考题单选题While deploying a new switch， you accidently connect ports 3/12 and 3/18 together， creating a loop. STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？（）A Port 3/12 was already up and forwarding before the loop was created.B Port priority is based on lowest priority and lowest port number.C You connected the wire on port 3/18 last.D None of the above， it is purely random.

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考题多选题Which three statements about RSTP are true？（）ARSTP significantly reduces topology reconverging time after a link failure.BRSTP expends the STP port roles by adding the alternate and backup roles.CRSTP port atates are blocking，discarding，learing，orforwarding.DRSTP also uses the STP proprsal-agreement sequence.ERSTP use the same timer-baseed processas STP on point-to-pointlinks.FRSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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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.

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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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考题多选题Which two statements best describe spanning-tree BPDU processing for a blocking port？（）ABPDUs that enter a blocking port are discarded.BBPDUs that enter a blocking port are processed.CLoopguard puts an interface into a loop-inconsistent state when BPDUs stop being received on a blocking port.DBPDUs are only processed on forwarding ports.

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考题单选题While deploying a new switch， you accidently connect ports 3/12 and 3/18 together， creating a loop. STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？（）A Port 3/12 was already up and forwarding before the loop was created.B Port priority is based on lowest priority and lowest port number.C You connected the wire on port 3/18 last.D None of the above， it is purely random.

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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

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考题单选题Which of the following will generate an RSTP topology change notification？（）A an edge port that transitions to the forwarding stateB a non-edge port that transitions to the blocking stateC a non-edge port that transitions to the forwarding stateD an edge port that transitions to the blocking stateE any port that transitions to the blocking stateF any port that transitions to the forwarding state

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考题单选题What value is primarily used to determine which port becomes the root port on each nonroot switch in aspanning-tree topology？（）A lowest port MAC addressB port priority number and MAC address.C VTP revision numberD highest port priority number.E path cost

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考题多选题What two things will occur when an edge port receives a BPDU？（）AThe port immediately transitions to the Forwarding state.BThe switch generates a Topology Change Notification （TCN） BPDU.CThe port immediately transitions to the err-disable state.DThe port becomes a normal STP switch port.

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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

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考题多选题Which two RSTP port roles include the port as part of the active topology？（）ArootBdesignatedCalternateDbackupEforwardingFlearning

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