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单选题When STP UplinkFast is enabled on a switch utilizing the default bridge priority， what will the new bridgepriority be changed to？（）A 8192B 16384C 49152D 65535

题目
单选题
When STP UplinkFast is enabled on a switch utilizing the default bridge priority， what will the new bridgepriority be changed to？（）
A

8192

B

16384

C

49152

D

65535

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相似问题和答案

第1题：

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 enable

B．set spantree backbonefast enable

C．set spantree uplinkfast enable

D．set spantree portfast bpdu-filter enable


正确答案：C
解析：UplinkFast的功能是当生成树拓扑结构发生变化，或在使用上连链路组的冗余链路之间完成负载平衡时，直接从阻塞状态进入到转发状态，从而提高直接链路失效后网络的收敛速度。使能catalyst 6500交换机upLinkFast功能的配置语句如下。
  switch-PHY-6500＞(enable) set spantree uplinkfast enable

第2题：

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 enable

B．set spantree uplinkfast enable

C．set spantree portfast 3/2 enable

D．set spantree portfast bpdu-filter enable


正确答案：A
解析：当一台交换机的根端口或阻塞端口接收到劣质BPDUs包时，说明该交换机到根网桥的间接链路有问题，网络中可能出现交换机到根网桥的链路失效故障。按生成树的一般操作规则，交换机的阻塞端口在转换成转发工作状态之前，需要等待一个生成树最大存活时间(约为30s)。为了省去端口状态转换等待时间，提高网络的收敛速度，可以通过配置交换机STP可选的BackboneFast功能，让端口直接跳过侦听和学习状态而进入转发状态。使能Catalyst 6500交换机backbonefast功能的配置语句如下：
Switch-PHY-6500＞(enable) set spantree backbonefast enable

第3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

A．set spanctree backbenefast enable

B．set spanctree uplinkfast enable

C．set spanctree portfst3/2 enable

D．set spanctree portfast bpdu-filter enable


正确答案：B

第4题：

You have configured voice VLANs on Catalyst switch R1.  Which two statements are true about the  operation of voice VLANs on this device？ （）

  • A、 When the voice VLAN feature is enabled， all untagged traffic is sent according to the default  CoS priority of the port.
  • B、 Enabling voice VLANs enables the switch to create multiple queues for traffic that is entering a  port.
  • C、 When voice VLANs are configured on a trunk link， UplinkFast must also be enabled.
  • D、 Voice VLANs are configured to enable the switch to forward frames marked with the proper  CoS values over separate physical links.
  • E、 Enabling voice VLANs enables the switch to forward frames with a specific 802.1P marking.

正确答案:A,E

第5题：

When NIC teaming is used, how are Loops avoided in a virtual switch?（）

  • A、By using active / passive teaming with spanning tree on the active Iink
  • B、By using active / passive teaming with onIy the active Iink in use
  • C、By using active / activate teaming with VM utilizing both uplink ports

正确答案:B

第6题：

When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?

A．when all switches have the same BID as the root switch

B．when all switches have received the MAC address of each neighboring switch

C．when every enabled switch port has been assigned a unique identifier

D．when every operating switch port is in either the blocking or forwarding state

E．when all switches are in either client, server, or transparent mode


正确答案：D
解析：Explanation:
States of the Spanning Tree Protocol:
Blocking A blocked port won't forward frames; it just listens to BPDUs. All ports are in blocking state by default when the switch is powered up. The purpose of the blocking state is to prevent the use of looped paths.

Listening The port listens to BPDUs to make sure no loops occur on the network before passing data frames. A port in listening state prepares to forward data frames without populating the MAC address table.

Learning The switch port listens to BPDUs and learns all the paths in the switched network. A port in learning state populates the MAC address table but doesn't forward data frames.

Forwarding The port sends and receives all data frames on the bridged port.

Disabled A port in the disabled state does not participate in the frame. forwarding or STP. A port in the disabled state is virtually nonoperational. In Blocking States, all ports are in blocking state. The purpose of the blocking state is to prevent the use of looped paths. The forward state sends and receives the all data frames in a loop free network. So these two states are considered to be fully converged.

第7题：

When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?（）

  • A、when all switches have the same BID as the root switch
  • B、when all switches have received the MAC address of each neighboring switch
  • C、when every enabled switch port has been assigned a unique identifier
  • D、when every operating switch port is in either the blocking or forwarding state
  • E、when all switches are in either client, server, or transparent mode

正确答案:D

第8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 enable

B ） set spantree uplinkfast enable

C ） set spantree portfast 3/2 enable

D ） set spantree portfast bpdu-filter enable


正确答案：A

第9题：

Which three of these pre-requisite for resetting a Catalyst Express 500 switch when Cisco Network Assistant is unavailable？（）

  • A、At Least one enabled switch port that is unconnected to any device
  • B、A PC pre-configured with a specific IP Address and Mask
  • C、A PC or laptop with Windows 2000 or Windows XP installed and a web browser that has Java Script enabled
  • D、Physical Access to Switch
  • E、A Switch with no connected devices

正确答案:A,C,D

第10题：

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.

正确答案:B,D

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