[单选]
The network administrator has enabled BPDU guard on the LAN.
Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？（）

A . BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network.
B . BPDU guard can guarantee proper selection of the root bridge.
C . BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.
D . BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.
E . None of the other alternatives apply

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The network administrator has enabled BPDU guard on the LAN.
Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？（）

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[单选] The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？ （）

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[单选]
The network administrator has enabled BPDU guard on the LAN.
Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？（）