Questions

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

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

A.
blocking

B.
learning

C.
disabled

D.
forwarding

E.
listening

Discussion

11 Responses to “Which two states are the port states when RSTP has converged?”

  1. James Bond says:

    Answer: A D

    Explanation

    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. ashxheat says:

    blocking too is not correct and useless in such state it must be discarding

  3. iCalvyn.com says:

    Look like this question had difference answer from many sources, which one is correct?

  4. Vlad says:

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

  5. Vlad says:

    B – no…

  6. 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.

  7. 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.

  8. 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?):

    http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml#states

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