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At which lay er of the OSI model does the Spanning Tree Prot

题目
单选题
At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at（）
A

Lay er 5

B

Lay er 4

C

Lay er 3

D

Lay er 2

E

Lay er 1

参考答案和解析
正确答案： D
解析： 暂无解析
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相似问题和答案

第1题：

In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

A．Blocking

B．Listening

C．Forwarding

D．Learning

E．Relaying


正确答案：CD
解析：Explanation:
STP uses a couple of port states besides forwarding and blocking.
1. Listening - Listens to incoming Hello messages to ensure that there are no loops, but does not forward traffic. This is an interim state between blocking and forwarding.

2. Learning - Still listens to BPDUs, plus learns MAC addresses from incoming frames. It does not forward traffic. This is an interim state between blocking and forwarding.

3. Disabled - Administratively down.

第2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3题：

In which of the following layers of the OSI model does the TCP protocol operate?()

A.Session

B.Network

C.Data link

D.Transport


参考答案：D

第4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5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6题：

At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at()

A.Lay er 5

B.Lay er 4

C.Lay er 3

D.Lay er 2

E.Lay er 1


参考答案：D

第7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8题：

At which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?

A．Transport

B．Physical

C．Application

D．Data link

E．Network


正确答案：D
解析：Explanation:
CDP is a device discovery protocol that runs over Layer 2 (the data link layer) on all Cisco-manufactured devices (routers, bridges, access servers, and switches) and allows network management applications to discover Cisco devices that are neighbors of already known devices. With CDP, network management applications can learn the device type and the Simple Network Management Protocol (SNMP) agent address of neighboring devices running lower-layer, transparent protocols.

第9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10题：

Which two of the following values does STP take into consideration when it elects the root bridge?（）

  • A、The BPDU version number
  • B、The access layer bridge setting
  • C、The Bridge ID
  • D、The spanning-tree update number
  • E、The bridge priority
  • F、The VLAN number

正确答案:C,E

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