Which STP role is responsible for forwarding frames on a specific network segment?

Which STP role is responsible for forwarding frames on a specific network segment?

• A. Root port
• B. Non-designated port
• C. Designated port
• D. Alternate port

Answer: (C)

In STP, every network segment has one port that forwards frames onto that segment—the designated port. This port is chosen as the one on the segment with the best path to the root bridge (lowest path cost, then lowest bridge ID, then lowest port ID if needed). Because the designated port is in forwarding state, it actively sends and receives frames to and from devices on that segment, keeping the segment connected to the spanning tree without creating a loop. Other ports on the same segment are placed in a non-designated (blocked) role to prevent loops. So the port responsible for forwarding frames on a specific network segment is the designated port.

In STP, every network segment has one port that forwards frames onto that segment—the designated port. This port is chosen as the one on the segment with the best path to the root bridge (lowest path cost, then lowest bridge ID, then lowest port ID if needed). Because the designated port is in forwarding state, it actively sends and receives frames to and from devices on that segment, keeping the segment connected to the spanning tree without creating a loop. Other ports on the same segment are placed in a non-designated (blocked) role to prevent loops. So the port responsible for forwarding frames on a specific network segment is the designated port.