Etherchannel and LACP

[Jose Manuel Garcia]

Hi all

I'm trying to get my CCNA certification and I'm trying to make lots of test to check if my level is good enough.

One of the question I have some doubts is the following:

Question: When configuring an EtherChannel bundle, which mode enables LACP only if a LACP device is detected?

A. Passive

B. Desirable

C. On

D. Auto

E. Active

The correct answer seems to be  A, but I think is E. In fact 

What do you think and why?

Thank you in advance.

[chris noon]

Hi Jose,

As the question refers to LACP the answer could only be A (passive) or E (active).  In active mode the port sends out packets in an attempt to bring up the LACP configuration.  In passive mode the port will wait to receive packets from another link in active mode.  

Passive mode will not initiate an LACP connection where as active mode try's to initiate an LACP link.

If the answer is A the reason will be in the subtleties of the way the question is asked.  A port in passive mode will come up, only if another LACP port (in active mode) is detected.

I hope that helps.

[Jose Manuel Garcia]

Hi chris,

Well, I'm not quite sure the correct answer is A. The web where I found this question at least says so...

I hope there is not too much questions like this (not clearly made) in the certification exam.

[chris noon]

Unfortunately there are typically a few questions like this in all vendor exam papers.  Just make sure you read each question carefully before answering as 1 word can change the way the question should be answered.

[Jose Manuel Garcia]

Yes I know. I'll be careful but English is not my mother tongue and it is very easy to get confused.....

Thank you anyway.

[azibnaseem · Accepted solution]

Hi [@jomagaro.garcia]  '

Correct answer is A. Based on your question, I have snipped the screen shot of channel-group command from real time ointment. Please review the attached screen shot.

Regards'

[Jose Manuel Garcia]

Thank you very much.

It is the best way to leave doubts

[azibnaseem]

Hey [@jomagaro.garcia]  

Yes it is the the best way. Glad to hear that.

Regards'