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spanning-tree extend system-id

Dear All,

 

i am preparing for my CCNP-Switch exam and using cisco practice question, i have faced following question regarding extended system-id and is confusing me, i would highly appreciate your valuable answer.

Question.

What is the effect of the given configuration?

spanning-tree extend system-id

spanning-tree mode pvst

spanning-tree backbonefast

 

A:It enables the reduced MAC address feature.

B:It enables spanning-tree to create dynamic system IDs.

C:....

D:....

option C and D are incorect so i didnot write them here.

from my researchs, i have found that the both ansers are true, but in the exam i should select only one option, what does your knowledge/experince says ?

 

Best regards and thanks in advance.

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Re: spanning-tree extend system-id

Hi @mohammadnouman86 ,

 

The correct answer is B.
I think this link explains very well the operation of the spanning-tree extend system-id command:

https://learningnetwork.cisco.com/thread/21718

 

Regards

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