问答题what is portfast？
问答题
what is portfast？
参考解析
解析：
暂无解析
相关考题：
（ 20 ）提高 Catalyst 6500 发生间接链路失效的收敛速度，正确配置 STP 可选功能的命令是A ） set spantree backbonefast enableB ） set spantree uplinkfast enableC ） set spantree portfast 3/2 enableD ） set spantree portfast bpdu-filter enable
为了提高Catalyst 6500交换机在发生直接链路失效时的收敛速度，正确配置STP可选功能的命令是______。A．set spantree portfast 3/2 enableB．set spantree backbonefast enableC．set spantree uplinkfast enableD．set spantree portfast bpdu-filter enable
WhichstatementcorrectlydescribestheCiscoimplementationofRSTP?() A.PortFast，UplinkFast，andBackboneFastspecificconfigurationsareignoredinRapidPVSTmode.B.RSTPisenabledgloballyandusesexistingSTPconfiguration.C.Rootandalternativeportstransitionimmediatelytotheforwardingstate.D.Convergenceisimprovedbyusingsub-secondtimersfortheblocking，listening，learning，andforwardingportstates.
Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?() A.BackboneFastB.UplinkFastC.Root GuardD.BPDU GuardE.BPDU Filter
下面哪项交换机的功能能实现关闭正在接受BPDU且配置了PortFast接口?() A.BackboneFastB.UplinkFastC.RootGuardD.BPDUGuardE.BPDUFilter
提高Catalyst 6500发生间接链路失效的收敛速度，正确配置STP可选功能的命令是______。A．set spantree backbonefast enableB．set spantree uplinkfast enableC．set spantree portfast 3/2 enableD．set spantree portfast bpdu-filter enable
下面哪项交换机的功能能实现关闭正在接受BPDU且配置了PortFast接口？（）A、 BackboneFastB、 UplinkFastC、 Root GuardD、 BPDU GuardE、 BPDU Filter
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.
You work as a network Technician. A new workstation has consistently been unable to obtain anIP address from the DHCP server when the workstation boots. Older workstations function normally， and the new workstation obtains an address when manually forced to renew its address. What should be configured on the switch to allow the workstation to obtain an IP address at boot？（）A、UplinkFast on the switch port connected to the serverB、BackboneFast on the switch port connected to the serverC、PortFast on the switch port connected to the workstationD、trunking on the switch
The voice VLAN feature has been enabled on a new Company Catalyst switch port. What is the effect of this？ （）A、The CoS is trusted for 802.1P or 802.1Q tagged traffic.B、PortFast is disabled on the port.C、Port Security is automatically enabled on a voice VLAN port.D、Untagged traffic is sent according to the default CoS priority of the port.E、None of the other alternatives apply
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.
Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）A、BackboneFastB、UplinkFastC、Root GuardD、BPDU GuardE、BPDU Filter
The following was configured on a switch： Switch（config） # spanning-tree portfast bpdufilter default What is the effect of this configuration command？（）A、If BPDUs are received by a port configured for PortFast， they are ignored and none are sent.B、The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.C、If BPDUs are received by a port configured for Portfast， the port will transition to forwarding state.D、If BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally.E、None of the other alternatives apply.
Which two statements are true about the configuration of voice VLANs？（）A、Static secure MAC addresses can be configured in conjunction with voice VLANs.B、PortFast is automatically enabled when voice VLANs are configured.C、PortFast must be manually configured when voice VLANs are configured.D、Voice VLANs are typically configured on uplink ports.E、Voice VLANs are typically configured on access ports.
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
Prior to 802.1w，Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）A、Only UplinkFast and BackboneFast are specified in 802.1w；PortFast must be manually configured.B、Only PortFast is specified in 802.1w；UplinkFast and BackboneFast must be manually configured.C、None of the proprietary Cisco enhancements are specified in 802.1w.D、PortFast，UplinkFast，and BackboneFast are specified in 802.1w.
单选题提高Caralyst 6500发生直接链路失效的收敛速度，正确配置STP可选功能的命令是（ ）。Aset spantree backbonefast enableBset spantree uplinkfast enableCset spanttee portfast 3/2 enableDset spantree portfast bpdu-filter enable
单选题Which statement correctly describes enabling BPDU guard on an access port that is also enabled for PortFast？（）AUpon 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.BThe access port ignores any received BPDU.CIf the port receives a BPDU， it is placed into the error-disable state.DBPDU guard is only configured globally and the BPDU filter is required for port-level configuration.
单选题Which spanning-tree command would cause a PortFast-enabled interface to lose its PortFast-operational status and disable BPDU filtering if it receives BPDUs？（）Aspanning-tree guard rootBspanning-tree portfast bpduguard defaultCspanning-tree bpduguard enableDspanning-tree bpdufilter enableEspanning-tree portfast bpdufilter default
单选题Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）ABackboneFastBUplinkFastCRoot GuardDBPDU GuardEBPDU Filter
单选题When troubleshooting the issue， you notice the election of a new root bridge with an unknown MAC address. Knowing that all access ports have the PortFast feature enabled， what would be the easiest way to resolve the issue without losing redundant links？（）AEnable bpduguard globally.BEnable rootguard.CEnable loopguard.DEnable spanning tree.EEnable UDLD
多选题Which of the following characteristics describe the BPDU Guard feature（）AABPDU Guard port should only be configured on ports with PortFast enabled.BBPDU Guard and PortFast should not be enabled on the same port.CBPDU Guard is used to ensure that superior BPDUs are not received on a switch port.DABPDU Guard port receiving a BPDU will go into err-disablestate.EABPDU Guard port receiving a BPDU will be disabled.FBPDU Guard can be enabled on any switch port.
多选题Which two are natively included by the IEEE 802.1w standard？（）Ainstances can control a selection of VLANsBload balancingCfast transition to forwarding stateDbackbone，uplink，and portfast （or equivalent）Eroot，loop，and BPDU guard （or equivalent）
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.