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When STP 802.1D has finished its convergence; which of the following are two possible port states? (Choose two)
Forwarding
Listening
Learning
Blocking
Discarding
Convergence happens when all ports on bridges and switches have transitioned to either the forwarding or blocking modes. The ports on a bridge or switch running STP can transition through five different states. When the network needs to re-converge, the Listening state takes about 15 seconds, followed by the Learning state that usually takes another 15 seconds, and 20 seconds to change to Forwarding, Blocking or Disabled. If no timers have been changed the total time of convergence is about 50 seconds. For more information refer to: [http://www.tech-faq.com/spanning-tree-protocol.html]
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