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Which are states in 802.1D Spanning Tree Protocol? (Choose three)
Listening
Discarding
Alternate
Blocking
Backup
Learning
STP 802.1D or Common Spanning Tree (CST) has five port transitions occurring approximately in 50 seconds, by default from blocking, listening, learning, forwarding and disable. For more information refer to: [http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html]
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