Which two states are the port states when RSTP has converged?

Which two states are the port states when RSTP has converged? (choose two)






13 Comments on “Which two states are the port states when RSTP has converged?

  1. James Bond says:

    Answer: A D


    RSTP only has 3 port states that are discarding, learning and forwarding. When RSTP has converged there are only 2 port states left: discarding and forwarding but the answers don’t mention about discarding state so blocking state (answer A) may be considered the best alternative answer

  2. Vlad says:

    I think B and D! Because RSTP has three types of port states: discarding, learning and forwarding.”disabled” is nonsense…

  3. Gary says:

    A and D.

    STP (802.1D) RSTP (802.1w)
    Disabled Discarding
    Blocking Discarding
    Listening Discarding
    Learning Learning
    Forwarding Forwarding

    •The port is in the blocking state, which means discarding in a stable topology.

  4. Newbie says:

    Yesterday i passed 200-120 and this question was in my exam with available answers such as:
    A. discarding
    B. learning
    C. disabled
    D. forwarding
    E. listening

    So, right answers is A and D.
    Looks like Cisco fixed it.

  5. Jim says:

    Answer is B & D. In RSTP a number of port states now come under ‘Discarding’.

    A. blocking -> Discarding
    B. learning
    C. disabled -> Discarding
    D. forwarding
    E. listening -> Discarding.

    So the only 2 RSTP port states listed are B & D. B doesnt sounds right in a converged network, however, according to Cisco the ‘Learning’ state is present in an Active topology (ie converged?):


  6. Henrique says:

    Read carefully:

    Definitely is blocking and forwarding.

    Both ports on the link between A and the root are put in designated blocking as soon as they come up. Thus far, everything behaves as in a pure 802.1D environment. However, at this stage, a negotiation takes place between Switch A and the root. As soon as A receives the BPDU of the root, it blocks the non-edge designated ports. This operation is called sync. Once this is done, Bridge A explicitly authorizes the root bridge to put its port in the forwarding state.

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