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Refer to the exhibit. An old switch with default values is introduced to a fully STP converged Switched LAN with default values. What can be done to maintain the same STP topology and avoid the Old_switch to provoke a root bridge reelection?

Configure the port costs to be higher than the Old_switch.

Configure default costs on all links.

Enable BPDU Guard.

Re-configure root bridge priorities.

Explanation

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