Which of the following is NOT a role of RSTP ports?

The correct answer is C. Fallback Port (FP) is not a role defined within the Rapid Spanning Tree Protocol (RSTP). RSTP utilizes specific port states and roles to manage and optimize the network topology and prevent loops.

In RSTP, the Root Port (RP) is the port on a switch that is closest to the root bridge in terms of path cost. This port is essential for participating in the decision-making process of the Spanning Tree, allowing communication towards the root bridge.

The Designated Port (DP) is the port on a network segment that has the lowest cost to the root bridge and is responsible for forwarding traffic toward that segment. It plays a crucial role in ensuring that packets can traverse the segment without looping back to the root.

The Alternate Port (AP) serves as a backup to the Root Port. If the Root Port goes down, the Alternate Port can take over, facilitating redundancy and providing a quick failover mechanism. This greatly enhances the network's resilience to link failures.

Fallback Port, however, is not recognized as a valid port role within RSTP. This option does not fit into the RSTP framework, which focuses on specific roles designed to optimize network efficiency and maintain a loop-free