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.
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.
相关考题：
What are the switch and bridge port characteristics of a layer two spanning－tree network that is fully converged?() A. All switch and bridge ports are in the forwarding state.B. All switch and bridge ports are in the stand-by state.C. All switch and bridge ports are assigned as either root or designated ports.D. All switch and bridge ports are in either the forwarding or blocking state.E. All switch and bridge are either blocking or looping.
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.
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，orforwarding.D、RSTP also uses the STP proprsal-agreement sequence.E、RSTP use the same timer-baseed processas STP on point-to-pointlinks.F、RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
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
Which two statements best describe spanning-tree BPDU processing for a blocking port？（）A、BPDUs that enter a blocking port are discarded.B、BPDUs that enter a blocking port are processed.C、Loopguard puts an interface into a loop-inconsistent state when BPDUs stop being received on a blocking port.D、BPDUs are only processed on forwarding ports.
Which two of the following statements describe a routed switch port on a multilayer switch？（）A、Layer 2 switching and Layer 3 routing are mutually supported.B、The port will not be associated with any VLAN.C、The routed switch port supports VLAN subinterfaces.D、The routed switch port is used when a switch has only one port per VLAN or subnet.E、The routed switch port ensures that STP remains in the forwarding state.
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
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
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.
Which statement correctly describes enabling BPDU guard on an access port that is also enabled for PortFast？（）A、Upon startup， the port transmits 10 BPDUs. If the port receives a BPDU， PortFast and BPDU guard are disabled on that port and it assumes normal STP operation.B、The access port ignores any received BPDU.C、If the port receives a BPDU， it is placed into the error-disable state.D、BPDU guard is only configured globally and the BPDU filter is required for port-level configuration.
STP的端口状态的变化顺序是（）A、Blocking，learing，listening，forwardingB、Blocking，learing，forwarding，listeningC、Blocking，listening，learing，forwardingD、Blocking，forwarding，listening，learing
Which statement correctly describes the Cisco implementation of RSTP？ （）A、PortFast， UplinkFast， and BackboneFast specific configurations are ignored in Rapid PVST mode.B、RSTP is enabled globally and uses existing STP configuration.C、Root and alternative ports transition immediately to the forwarding state.D、Convergence is improved by using sub-second timers for the blocking， listening， learning， and forwarding port states.
Which two statements are true about BPDU port-guard and BPDU filtering？（）A、BPDU port-guard can be enabled globally， whereas BPDU filtering must be enabled on a per-interface basis.B、When globally enabled， BPDU port-guard and BPDU filtering apply only to PortFast enabled ports.C、When globally enabled， BPDU port-guard and BPDU filtering apply only to trunking-enabled ports.D、When a BPDU is received on a BPDU port-guard enabled port， the interface goes into the err-disabled state.E、When a BPDU is received on a BPDU filtering enabled port， the interface goes into the err-disabled state.F、When a BPDU is received on a BPDU filtering enabled port， the interface goes into the STP blocking state.
Under which two circumstances would an RSTP bridge flush its CAM table？（）A、upon a port state changeB、upon receiving a topology change notificationC、when transitioning from discarding to forwardingD、when transitioning from forwarding to discardingE、only when changing from listening to discardingF、when CAM resources have been completely used up
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.
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.
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.
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.
多选题Under which two circumstances would an RSTP bridge flush its CAM table？（）Aupon a port state changeBupon receiving a topology change notificationCwhen transitioning from discarding to forwardingDwhen transitioning from forwarding to discardingEonly when changing from listening to discardingFwhen CAM resources have been completely used up
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？（）APort 3/12 was already up and forwarding before the loop was created.BPort priority is based on lowest priority and lowest port number.CYou connected the wire on port 3/18 last.DNone of the above， it is purely random.
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.
单选题Which statement is correct about RSTP port roles？（）AThe 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.BThe 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.CThe 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.DThe 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.
单选题The temperature （） a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure （） it is subjected in the containing vessel.Aat which/to whichBfrom which/at whichCto which/from whichDin which/on which
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
多选题Which two statements concerning STP state changes are true？ （）AUpon bootup，a port transitions from blocking to forwarding because it assumes itself as root.BUpon bootup，a port transitions from blocking to listening because it assumes itself as root.CUpon bootup，a port transitions from listening to forwarding because it assumes itself as root.DIf a forwarding port receives no BPDUs by the max_age time limit， it will transition to listening.EIf a forwarding port receives an inferior BPDU， it will transition to listening.FIf a blocked port receives no BPDUs by the max_age time limit， it will transition to listening.
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.
单选题What is the STP root guard feature designed to prevent？（）Aa root port being transitioned to the blocking stateBa port being assigned as a root portCa port being assigned as an alternate portDa root port being transitioned to the forwarding state