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Which four Cisco priority Spanning Tree Protocol enhancement

题目
多选题
Which four Cisco priority Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning Tree？ （）
A

PortFast

B

UplinkFast

C

loop guard

D

root guard

E

BPDU guard

F

BackboneFast

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相似问题和答案

第1题：

要确保交换机成为VLAN30的根网桥,可使用下面哪两个命令之一?()

A.spanning-tree vlan 30 priority 0

B.spanning-tree vlan 30 priority 16384

C.spanning-tree vlan 30 root guarantee

D.spanning-tree vlan 30 root primary


答案：AD

第2题：

Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per－VLAN Spanning－Tree plus?()

A. PortFast

B. UplinkFast

C. loop guard

D. root guard

E. BPDU guard

F. BackboneFast


参考答案：A, C, D, E

第3题：

Catalyst 3500(Cisco．[OS系统)中配置PortFast生成树可选功能的命令格式是——。

A．set spanning—tree portfast<mod／port>enable

B．set spanning-tree portfast<mod／port>enable

C．spanning—tree portfast default

D．set spanning—tree portfast<mod／port>default


正确答案：C
解析：选项A)、B)、D)是Catalyst 6500(Catalyst OS系统)配置PortFast生成树可选功能的命令，故选c)。

第4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

正确答案:C

第5题：

Which two values are used by Spanning Tree Protocol to elect a root bridge?（）

  • A、amount of RAM
  • B、bridge priority
  • C、IOS version
  • D、IP address
  • E、MAC address
  • F、speed of the links

正确答案:B,E

第6题：

Under which two circumstances should Spanning Tree Protocol be implemented?()

A. to ensure a loop-free topology

B. to protect against user-side loops

C. when a VLAN spans access layer switches

D. for the most deterministic and highly available network topology

E. because of the risk of lost connectivity without Spanning Tree Protocol


参考答案：B, C

第7题：

Which command enables RSTP on aswitch?()

A.spanning-tree mode rapid-pvst

B.spanning-tree uplinkfast

C.spanning-tree backbonefast

D.spanning-tree mode mst


参考答案：A

第8题：

Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?

A. Designated ports.

B. Duplex operating mode.

C. Fast mode ports.

D. Root bridge.

E. Root ports.

F. BDPU priority.


正确答案：ADE
A,D,E 解析：Explanation:
Designated port: Either a root port or a port that has been determined as having the best (lower) cost-a designated port will be marked as a forwarding port.

Root bridge: The root bridge is the bridge with the best bridge ID. With STP, the key is for all the switches in the network to elect a root bridge that becomes the focal point in the network. All other decisions in the network-like which port is to be blocked and which port is to be put in forwarding mode-are made from the perspective of this root bridge.

Root port: Always the link directly connected to the root bridge, or the shortest path to the root bridge. If more than one link connects to the root bridge, then a port cost is determined by checking the bandwidth of each link. The lowest cost port becomes the root port.

So these three components must be elected before the spanning tree protocol can converge in a switched LAN

第9题：

Which four Cisco priority Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning Tree？ （）

  • A、 PortFast
  • B、 UplinkFast
  • C、 loop guard
  • D、 root guard
  • E、 BPDU guard
  • F、 BackboneFast

正确答案:A,C,D,E

第10题：

panning Tree Protocol calculates path cost based on which of these？（）

  • A、interface bandwidth
  • B、interface delay
  • C、interface bandwidth and delay
  • D、hop count
  • E、bridge priority

正确答案:A

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