As a network administrator, you observe that several switch ports are not forwarding user data frames and are not learning any MAC addresses, yet they continue to listen for Bridge Protocol Data Units (BPDUs). In which STP port state are these ports operating?
Ports in the blocking state discard all user data frames and do not learn MAC addresses, but they still receive BPDUs so the switch can monitor the spanning-tree topology. This prevents loops while keeping the port ready to transition if the topology changes.
Learning ports also do not forward user frames, but they do learn MAC addresses, so they do not match the scenario.
Forwarding ports actively send and receive user traffic as well as BPDUs.
Disabled ports are administratively shut down and do not participate in STP or frame forwarding at all.
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Cisco CCNA 200-301
Network Access
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