Which statement correctly describes enabling BPDU guard on a

第1题：

Which of the following characteristics describe the BPDU Guard feature（）

• A、ABPDU Guard port should only be configured on ports with PortFast enabled.
• B、BPDU Guard and PortFast should not be enabled on the same port.
• C、BPDU Guard is used to ensure that superior BPDUs are not received on a switch port.
• D、ABPDU Guard port receiving a BPDU will go into err-disablestate.
• E、ABPDU Guard port receiving a BPDU will be disabled.
• F、BPDU Guard can be enabled on any switch port.

第2题：

Which two are natively included by the IEEE 802.1w standard？（）

• A、instances can control a selection of VLANs
• B、load balancing
• C、fast transition to forwarding state
• D、backbone，uplink，and portfast （or equivalent）
• E、root，loop，and BPDU guard （or equivalent）

第3题：

第4题：

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.

第5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 Fast
• B、Port Fast
• C、BPDU Guard
• D、Root Guard

第6题：

Which of the following characteristics describe the BPDU Guard feature？（Choose all that apply.）（）

• A、A BPDU Guard port should only be configured on ports with PortFast enabled
• B、BPDU Guard and PortFast should not be enabled on the same port.
• C、BPDU Guard is used to ensure that superior BPDUs are not received on a switch port
• D、A BPDU Guard port receiving a BPDU will go into err-disable state
• E、A BPDU Guard port receiving a BPDU will be disabled
• F、BPDU Guard can be enabled on any switch port

第7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

第8题：

第9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.

第10题：

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.