300-115 SWITCH 问题

shaw3560

QUESTION 210
When using EtherChannel misconfiguration guard, which technology is used to prevent this type of
misconfiguration from affecting the network?

A. LACP
B. port security
C. STP
D. PAgP


请问答案与解释。亲，我马上要考了。希望尽快答复！！谢谢！

shaw3560

我基本同意你的看法，准备选STP。我又看了下书上的相关部分，给大家做个参考。CCNP R&S SWITCH 300-115 Official Cert Guide P255 & P256.

To reduce the chances of a misconfigured EtherChannel, Cisco Catalyst switches run the EtherChannel Guard feature by default. You can control the feature with the following global configuration command:
  Switch(config)# [  no  ]   spanning-tree etherchannel guard misconfig  

Notice that the command is directly related to STP operation over an EtherChannel. If a
misconfiguration is detected once the interfaces are enabled, the switch will log the prob-
lem and will automatically shut the interfaces down and place them in the errdisable state.

Rockyw

shaw3560 发表于 2017-5-2 17:29
A 也是 EtherChannel 的协议，公有协议。

从题意上分析，当EtherChannel配置错误，什么技术能够避免这个错误对网络的影响，那么答案就应该就出来了吧。Etherchannel配错的话会出现环路，而STP就是为了解决环路问题而产生的技术，所以选C。

Rockyw

D吧，前面三个都跟EtherChannel都没联系

shaw3560

Rockyw 发表于 2017-5-2 12:18
D吧，前面三个都跟EtherChannel都没联系

A 也是 EtherChannel 的协议，公有协议。