Which feature can prevent a rogue device from assuming the role of the root bridge in a switching domain?
A. VTP
B. BPDU Filter
C. DTP
D. Root Guard
Which feature can prevent a rogue device from assuming the role of the root bridge in a switching domain?
D is the correct answer
The root guard feature provides a way to enforce the root bridge placement in the network.
The root guard ensures that the port on which root guard is enabled is the designated port. Normally, root bridge ports are all designated ports, unless two or more ports of the root bridge are connected together. If the bridge receives superior STP Bridge Protocol Data Units (BPDUs) on a root guard-enabled port, root guard moves this port to a root-inconsistent STP state. This root-inconsistent state is effectively equal to a listening state. No traffic is forwarded across this port. In this way, the root guard enforces the position of the root bridge.
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10588-74.html
D is the correct answer
The root guard feature provides a way to enforce the root bridge placement in the network.
The root guard ensures that the port on which root guard is enabled is the designated port. Normally, root bridge ports are all designated ports, unless two or more ports of the root bridge are connected together. If the bridge receives superior STP Bridge Protocol Data Units (BPDUs) on a root guard-enabled port, root guard moves this port to a root-inconsistent STP state. This root-inconsistent state is effectively equal to a listening state. No traffic is forwarded across this port. In this way, the root guard enforces the position of the root bridge.
The configuration of root guard is on a per-port basis. Root guard does not allow the port to become an STP root port, so the port is always STP-designated. If a better BPDU arrives on this port, root guard does not take the BPDU into account and elect a new STP root. Instead, root guard puts the port into the root-inconsistent STP state. You must enable root guard on all ports where the root bridge should not appear. In a way, you can configure a perimeter around the part of the network where the STP root is able to be located.
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10588-74.html
More info
http://ericleahy.com/index.php/bpdu-guard-bpdu-filter-root-guard-loop-guard-udld/#:~:targetText=BPDU%20Guard%3A%20Prevents%20accidental%20connection,devices%20to%20PortFast%2Denabled%20ports.&targetText=BPDU%20filtering%3A%20Restricts%20the%20switch,the%20root%20switch.
I say is it D
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10588-74.html
correct me if i am wrong pls
D correct
I guess it is wrong. Root Guard does not allow any rogue device to get the attributes of Root Bridge in Switching Domain. So the correct answer is D