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 is performing its normal operation in STP to prevent loops
The port has been administratively shut down due to a security violation
The 'Blocking' state is a normal condition in the Spanning Tree Protocol (STP) where the port is prevented from participating in frame forwarding to avoid loops. Even though other answers involve stages or scenarios where interruptions might occur, they generally do not cause a port to enter a 'Blocking' state directly as described by STP operations. A port does not go into 'Blocking' from being disabled due to security violations or due to overload (which may shut down the port entirely but typically flags it as 'Error Disabled'), and 'Configuring' is not a recognized standard port state in context of STP.
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What is Spanning Tree Protocol (STP)?
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What does it mean for a port to be in a 'Blocking' state?
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How does a switch determine when to put a port in a Blocking state?