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RSTP has these main port roles, Designated port, Root port and Blocking port (which is split into two port roles; Backup and Alternate). Of all these ports, which one receives more useful BPDUs from another bridge and is a blocked port?
Root Port
Backup Port
Designated Port
Blocking Port
Alternate Port
An alternate port is a blocked port that receives more useful BPDUs from another switch. A backup port is a blocked port that receives more useful BPDUs from the same switch. A root port is a forwarding port that receives the best BPDUs on a Root Bridge and is the closest (in terms of path cost) to the Root Bridge. A designated port is a forwarding port that sends the best BPDUs on the link to which it is connected. (http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html#roles)
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