Which two states are the port states when RSTP has converged? (choose two)
A.
blocking
B.
learning
C.
disabled
D.
forwarding
E.
listening
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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
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blocking too is not correct and useless in such state it must be discarding
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WHy??? http://www.9tut.com/ccna-stp-questions
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Look like this question had difference answer from many sources, which one is correct?
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I think B and D! Because RSTP has three types of port states: discarding, learning and forwarding.”disabled” is nonsense…
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If it’s learning then it’s not converged.
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WTF?!
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B – no…
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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.
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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.
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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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i think it will be A and D
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Read carefully:
http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html#converge2
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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Stop the speculation, take a look at the link for the facts.
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html
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