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Which command enhances the 802.1

题目

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
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相似问题和答案

第1题：

Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet?()

A. 802.3ad

B. 802.1w

C. 802.1Q

D. 802.1d


参考答案：C

第2题：

Which two of the following are designated fields for MAC tunneling protocol（802.1 ah）？（）

  • A、Service Ethertype
  • B、ISL
  • C、PseudoLAN TAG
  • D、802.1q VLAN TAG
  • E、Control Word
  • F、Tunnel Label

正确答案:A,C

第3题：

AnewCompanyswitchwasjustconfiguredusingthe"switchporttrunknativevlan7"command.Whatdoesthisinterfacecommandaccomplish?()

A.CausestheinterfacetoapplyISLframingfortrafficonVLAN7

B.ConfiguresthetrunkinginterfacetoforwardtrafficfromVLAN7

C.ConfigurestheinterfacetobeatrunkingportandcausestrafficonVLAN7tobe802.1qtagged

D.ConfiguresthetrunkinginterfacetosendtrafficfromVLAN7untagged

E.Noneoftheotheralternativesapply


参考答案：D

第4题：

The Company security administrator is concerned with VLAN hopping based attacks. Which two  statements about these attacks are true？ （）

  • A、 Attacks are prevented by utilizing the port-security feature.
  • B、 An end station attempts to gain access to all VLANs by transmitting Ethernet frames in the  802.1q encapsulation.
  • C、 Configuring an interface with the switchport mode dynamic command will prevent VLAN  hopping.
  • D、 An end station attempts to redirect VLAN traffic by transmitting Ethernet frames in the 802.1q  encapsulation.
  • E、 Configuring an interface with the "switchport mode access" command will prevent VLAN  hopping.

正确答案:B,E

第5题：

Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network?（）

  • A、802.1d
  • B、VTP
  • C、802.1q
  • D、STP
  • E、SAP

正确答案:A,D

第6题：

What is the effect of applying the switchport trunk encapsulation dot1q command to a port on a Cisco Catalyst switch？（）

  • A、By default， native VLAN packets going out this port will be tagged.
  • B、Without an encapsulation command， 802.1Q will be the default encapsulation if DTP fails to negotiate a trunking protocol.
  • C、The interface will support the reception of tagged and untagged traffic.
  • D、If the device connected to this port is not 802.1Q-enabled， it will not be able to handle 802.1Q packets.

正确答案:C

第7题：

Which encapsulation types are configurable on a Cisco switch for a trunk?（）

  • A、VTP
  • B、ISL
  • C、CDP
  • D、802.1Q
  • E、802.1p
  • F、LLC
  • G、IETF

正确答案:B,D

第8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9题：

Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet?（）

  • A、802.3ad
  • B、802.1w
  • C、802.1Q
  • D、802.1d

正确答案:C

第10题：

Which of the following specification will allow you to： associate VLAN groups to STP instances so  you can provide multiple forwarding paths for data traffic and enable load balancing？ （）

  • A、 IEEE 802.1d （STP）
  • B、 IEEE 802.1s （MST）
  • C、 IEEE 802.1Q （CST）
  • D、 IEEE 802.1w （RSTP）

正确答案:B

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