An engineer wants to make sure that Switch A is the preferred root bridge in the network, even if other switches are introduced. What should be configured on Switch A to achieve this?
Increase the port cost on Switch A's interfaces.
Configure Root Guard on Switch A's interfaces.
Set the spanning-tree priority to a lower value on Switch A.
In Rapid PVST+, the switch with the lowest bridge priority is elected as the root bridge. By setting a lower spanning-tree priority on Switch A, it ensures that Switch A becomes the root bridge. Enabling BPDU guard protects against unauthorized switches attempting to become root but does not influence the root election. Configuring Root Guard prevents designated ports from becoming root ports due to superior BPDUs received on that port but doesn't make Switch A the root. Increasing port cost would make paths through Switch A less preferred, which is the opposite of the desired effect.
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Cisco CCNA 200-301
Network Access
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