Which STP feature used to monitor BPDU traffic and enable STP to transition between states?
A. Root Guard
B. Loop Guard
C. BPDU Filter
D. BPDU Guard
Which STP feature used to monitor BPDU traffic and enable STP to transition between states?
Which STP feature used to monitor BPDU traffic and enable STP to transition between states?
A. Root Guard
B. Loop Guard
C. BPDU Filter
D. BPDU Guard
C:
BPDUfilter can be configured globally or on the interface level and there’s a difference:
Global: if you enable BPDUfilter globally then any interface with portfast enabled will not send or receive any BPDUs. When you receive a BPDU on a portfast enabled interface then it will lose its portfast status, disables BPDU filtering and acts as a normal interface.
Interface: if you enable BPDUfilter on the interface it will ignore incoming BPDUs and it will not send any BPDUs. This is the equivalent of disabling spanning-tree.
The correct answer is B. loop guard monitors BPDU activity on nondesignated ports and puts it on loop-inconsistent state to prevent a loop from forming. when BPDU is received again the loop guard allows the port to move through STP state to become active again. PBDU filter disable STP on a port.
Reference: page 210 on the cisco CCNP switch official certification guide.
agree with B. maybe the question may say “prevent trasitions”
If BPDU Filter is enabled globally with spanning-tree portfast bdpufilter default then if a BPDU arrives on a portfast port the port then transitions out of the portfast state and into listening, learning and then forwarding state.
BPDU Guard simply places the port in an err-disabled state which is not an STP state.
Answer should be C
I think the answer should be B, BPDU filter ignores the bpdus on the ports