Which STP protection feature should you use to prevent an inadvertent change in topology caused
by the receipt of a superior BPDU on an access interface?
A.
BPDU protection
B.
loop protection
C.
root protection
D.
topology protection
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imho right answer “A”
http://www.juniper.net/techpubs/en_US/junos16.1/topics/concept/spanning-trees-bpdu-protection-understanding-ex-series.html
To protect the state of spanning-tree protocols on switches from outside BPDUs, enable BPDU protection on the interfaces of a switch on which spanning-tree protocols are configured and are connected to user devices (such as PCs)—for example, on edge ports connected to PCs.
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i think you are correct in that BDPU protection will drops BPDUs received; however, it is used on edge ports. in this question the question is referring to preventing a port on the root switch transitioning to a forwarding state where another switch takes over root, think adding a new switch to the network thats already got a configuration and takes over root.
http://www.juniper.net/techpubs/en_US/junos15.1/topics/example/spanning-trees-root-protection-ex-series.html
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