In the following diagram, a converged STP topology is pictured with switch S3 as

Question

In the following diagram, a converged STP topology is pictured with switch S3 as the root bridge. Fill in the boxes with the appropriate port role (root port, designated port, or nondesignated port) in each case.

Explanation / Answer

The First Port connected to Root Bridge (S3) is the Designated Port (F0/1) 1 because on the root bridge, all ports are designated ports. Designated ports are in the forwarding state and can send and receive traffic and The Second one in forwarding direction is Root Port (connected to S1 (S3->S1)) F0/2 every non-root bridge must have a root port. All root ports are placed in forwarding state. The Boxes between the switches S1 and S2 are Non- designated ports and are blocked. The Box on lower left corner between S3 and S2 are F0/2 is Root Port. The Box connected to S3 F0/2 is a Designated port.

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