DRAG DROP
Drag and drop the RSTP port roles on the left to the correct description on the right.
Answer: 
Explanation:
Place the options in order from top to bottom:
designated
backup
root
alternate
Drag and drop the RSTP port roles on the left to the correct description on the right.
DRAG DROP
Drag and drop the RSTP port roles on the left to the correct description on the right.
http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html#roles