N10-005 Question #466: Real Exam Question with Answer & Explanation

The correct answer is C: Blocking. Spanning Tree Protocol (STP) uses five port states: Disabled, Blocking, Listening, Learning, and Forwarding. The Blocking state is specifically used to prevent switching loops - a port in this state receives BPDUs (Bridge Protocol Data Units) to stay aware of the topology but doe

Question

Which of the following STP states indicates an inactivated port due to a loop?

Options

ADisabled
BLearning
CBlocking
DForwarding

Explanation

Spanning Tree Protocol (STP) uses five port states: Disabled, Blocking, Listening, Learning, and Forwarding. The Blocking state is specifically used to prevent switching loops - a port in this state receives BPDUs (Bridge Protocol Data Units) to stay aware of the topology but does not forward any user traffic. STP places redundant ports into Blocking to break potential loops while keeping the path available as a standby. Disabled means the port is administratively shut down (unrelated to loop prevention), Learning means the port is building its MAC table but not yet forwarding, and Forwarding means the port is fully active.

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