Your network has been experiencing intermittent connectivity issues. After checking various switches, you notice that one switch port has a port state listed as 'Blocking'. What is the MOST likely reason for this port state?
The port is overloaded with traffic causing it to shut down
There is a configuration issue that left the port in a provisional state
The port has been administratively shut down due to a security violation
The port is performing its normal operation in STP to prevent loops
The 'Blocking' state is a normal operational state within the Spanning Tree Protocol (STP). STP intentionally places redundant ports in this state to prevent Layer 2 loops, which can cause broadcast storms and destabilize the network. A port that is shut down due to a security violation typically enters an 'err-disabled' state, not a 'blocking' state. An overloaded port might also be placed in an 'err-disabled' state or simply drop traffic. The term 'provisional state' is too vague and does not represent a standard STP state.
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What is the purpose of the Spanning Tree Protocol (STP)?
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What are the possible port states in STP?
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How does STP decide which ports go into a 'Blocking' state?