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

第1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2题：

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

第3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4题：

Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）

• A、BackboneFast
• B、UplinkFast
• C、Root Guard
• D、BPDU Guard
• E、BPDU Filter

第5题：

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.

第6题：

Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch？ （Choose  three.）（）  

• A、 The CoS value is trusted for 802.1p or 802.1q tagged traffic.
• B、 The voice VLAN feature is disabled by default.
• C、 The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.
• D、 When the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port.
• E、 PortFast is automatically disabled when a voice VLAN is configured.
• F、 The default CoS value for incoming traffic is set to 0.

第7题：

Which Cisco Catalyst switches fit in the access area？（）

• A、 Cisco Catalyst 2900 Series，Catalyst 7300 Series，and Catalyst 8000 Series
• B、 Cisco Catalyst 2900 Series，Catalyst 3700 Series，and Catalyst Series
• C、 Cisco Catalyst 2700 Series，Catalyst 7300 Series，and Catalyst 8000 Series
• D、 Cisco Catalyst 2700 Series，Catalyst 3700 Series，and Catalyst4500 Series

第8题：

第9题：

第10题：

第11题：

第12题：

第13题：

While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate（）。

• A、The port is experiencing errors
• B、The port is administratively disabled
• C、The port is blocked by spanning tree
• D、The port has an active link with normal traffic activity

第14题：

You need to configure a new Company Catalyst 3560 switch for a VOIP-enabled office.  Which  three statements are true about the voice VLAN feature on this switch？（）

• A、The default CoS value for incoming traffic is set up to 0.
• B、The CoS value is trusted for 802.1p or 802.1q tagged traffic.
• C、PortFast is automatically disabled when a voice VLAN is configured.
• D、The voice VLAN feature is disabled by default.
• E、The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.
• F、When the voice VLAN feature is enabled， all untagged traffic is sent according to the default  CoS priority of the port

第15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16题：

Which of these commands can you use to show if an operational Catalyst switch port is set for autonegotiation of speed and duplex when running Cisco IOS software?（）

• A、show port network
• B、 show running-config
• C、show controllers Ethernet-controller
• D、 show interfaces

第17题：

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.

第18题：

What is the purpose of the STP PortFast BPDU guard feature？ （）

• A、enforce the placement of the root bridge in the network
• B、ensure that a port is transitioned to a forwarding state quickly if a BPDU is received
• C、enforce the borders of an STP domain
• D、ensure that any BPDUs received are forwarded into the STP domain

第19题：

第20题：

第21题：

第22题：

第23题：