It takes time to get used to the terminology, it can be confusing.
This video explains most if not all the STP terms you mentioned and gives a good overview of the STP protocol.
http://www.youtube.com/watch?v=ihF_78oIaDI
Also Root Switch = Root Bridge = Designated Switch. They are different names for the same thing.
The Root Bridge/Switch is the Main Switch in the STP Topology, chosen by election.
A designated port is one that is active and forwarding traffic.
A Blocked port is one that is not active or forwarding traffic.
A Root Port is an active port that leads to the Root Bridge.
A designated port is either connected to a Root Port or a Blocked Port.
A Root Port is either connected to the Root Bridge or to another designated port but never a blocked port.
All ports on the Root Bridge/Switch are Designated ports by default as there are no blocking ports on a Root Bridge
HTH
This video explains most if not all the STP terms you mentioned and gives a good overview of the STP protocol.
http://www.youtube.com/watch?v=ihF_78oIaDI
Also Root Switch = Root Bridge = Designated Switch. They are different names for the same thing.
The Root Bridge/Switch is the Main Switch in the STP Topology, chosen by election.
A designated port is one that is active and forwarding traffic.
A Blocked port is one that is not active or forwarding traffic.
A Root Port is an active port that leads to the Root Bridge.
A designated port is either connected to a Root Port or a Blocked Port.
A Root Port is either connected to the Root Bridge or to another designated port but never a blocked port.
All ports on the Root Bridge/Switch are Designated ports by default as there are no blocking ports on a Root Bridge
HTH