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Which spanning-tree command would cause a PortFast-enabled i

题目
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？（）
A

spanning-tree guard root

B

spanning-tree portfast bpduguard default

C

spanning-tree bpduguard enable

D

spanning-tree bpdufilter enable

E

spanning-tree portfast bpdufilter default

参考答案和解析
正确答案： B
解析： 暂无解析
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相似问题和答案

第1题：

Which command enhances the 802.1D convergence time on ports that are connected to hosts?()

A. spanning-tree backbonefast

B. spanning-tree uplinkfast

C. spanning-tree portfast

D. spanning-tree cost512


参考答案：C

第2题：

I cannot think of anything ______ happened that day which I would have wished otherwise.

A.what

B.who
C.that
D.which

答案：C
解析：
本题考察定语从句，题目意为“我想不起来那天发生的任何事情，我本来不希望这样。”当先行词是anything, everything, nothing （something 除外）, few, all, none, little, some等代词时,限制性定语从句只能用that。

考点
定语从句

第3题：

Which of the following conditional clause is a real condition________?

A.If I had time, I would study French

B.If I have time, I will study French

C.If I had had time, I would have studied French

D.If I should have time, I would study French


答案：B

解析：条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设或实际可能性不大的甚至完全不可能发生的情况，故采用虚拟语气。

A选项中，if+主语+一般过去时表示与现在事实相反，为虚拟语气；B选项中，if引导的是一个一般现在时的条件状语从句，为真实条件句；C选项中，if+主语+had done表示与过去事实相反，为虚拟语气；D选项中，if+主语+should do表示与将来事实相反，为虚拟语气。题干意为：下列条件句中那个是真实条件，所以答案选B。

第4题：

Which command would you configure globally on a Cisco router that would allow you to view directly connected Cisco devices?（）

  • A、enable cdp
  • B、cdp enable
  • C、cdp run
  • D、run cdp

正确答案:C

第5题：

In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops can cause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limit excessive traffic during spanning-tree loop conditions？ （）

  • A、loop guard
  • B、storm control
  • C、storm suppression
  • D、broadcast suppression
  • E、BPDU guard

正确答案:B,D

第6题：

Which command enables RSTP on a switch?()

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7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？（）

  • A、spanning-tree guard root
  • B、spanning-tree portfast bpduguard default
  • C、spanning-tree bpduguard enable
  • D、spanning-tree bpdufilter enable
  • E、spanning-tree portfast bpdufilter default

正确答案:E

第8题：

Which command would correctly set a router‘s date and time?()

A.A

B.B

C.C

D.D


参考答案：C

第9题：

In Recovery Manager （RMAN）， you have set control file autobackup to ON by using the following command：  CONFIGURE CONTROLFILE AUTOBACKUP ON;  Which two events would cause the control file to be backed up automatically？ （）

  • A、a tablespace is taken offline
  • B、the database instance is restarted
  • C、a new data file is added to an existing tablespace
  • D、a successful backup is recorded in the RMAN repository
  • E、the RMAN connection is disconnected from the target database

正确答案:C,D

第10题：

Which command enables RSTP on a switch?（）

  • A、spanning-tree mode rapid-pvst
  • B、spanning-tree uplinkfast
  • C、spanning-tree backbonefast
  • D、spanning-tree mode mst

正确答案:A

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