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EtherChannel Questions

March 16th, 2020 Go to comments

If you are not sure about EtherChannel, please read our EtherChannel tutorial.

Question 1


In fact answer B is also correct as STP considers Etherchannel links as one physical link so this question should have three correct answers. But answer B is not as obvious as the other two answers so we should choose them.

Question 2


The Static Persistence (or “on” mode) bundles the links unconditionally and no negotiation protocol is used. In this mode, neither PAgP nor LACP packets are sent or received.

Question 3


From the neighbor status, we notice the “Flags” are SP. “P” here means the neighbor is in Passive mode. In order to create an Etherchannel interface, the (local) SW1 ports should be in Active mode. Moreover, the “Port State” in the exhibit is “0x3c” (which equals to “00111100″ in binary format). Bit 3 is “1” which means the ports are synchronizing -> the ports are working so the local ports should be in Active mode.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/3se/consolidated_guide/command_reference/b_consolidated_3650_3se_cr/b_consolidated_3650_3se_cr_chapter_0100.pdf

Comments (6) Comments
  1. Anonymous
    April 16th, 2020

    hi people!

    i can’t see questions on this page? Please help me… where they&

  2. Anonymous
    April 20th, 2020

    You have to paid the subscriptions in order to be able to see the questions

  3. Anonymous
    June 9th, 2020

    Does anyone know if these EtherChannel questions come with the exam (2020)?

  4. Anony
    July 17th, 2020

    how can I see the questions?

  5. JD
    September 16th, 2020

    just a quick comment to Q1 explanation:

    In fact STP can block etherchannel, because STP normally operates on this interface, so it is possible that the etherchannel port will be assigned Non-Designated role and will be blocked if some better route to Root Bridge will be available from such switch. So answer B is not correct in any way.

  6. JD
    September 16th, 2020

    I think you misunderstood the “STP does not block physical interfaces bundled into EtherChannel” statement which is true, but STP can block the portchannel interface.

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