Answer / jitendera sinha

this protocol is called BPDU.

remember that i am not going to expalin the prorty value
mac value.

BPDU is the best answer for the interview

if you need explanation then post it i will send the
explanation

Answer / satyam_0528

bridge protocol data unit (BPDU)

Answer / guest

the port that has the least cost toward the root bridge is
considered theroot port andthe one that is in the opposite
direction is considered the designated port.

now the one that has the better cost (remember lower is the
better)among the two parellel connections is considered the
forwarding port and the one that has higher cost is takes
as the blocking.

Answer / guest

@ Jitendera Sinh- Please don't misguide if u don't know the answer.

BPDU's are packets exchanged b/w switches to to know the interface to which it is connected to. (not protocol.

TO answer the question you need to explain the STP.
This is how entire STP works in simple words.

1.Lowest Bride ID will be elected as ROOT bridge.
2.All the ports of ROOT bridge will be DP
3.All ports directly connected to ROOT bridge will become RP
4.Based on the path cost to reach ROOT bridge, the Port will become RP(Other than directly connected bridge)
5.The Port to which RP is connected will be a DP.
6.All other(Extra) port will be either DP/BP based on the Bridge ID.(Lower will be DP)

Answer / guest

highest

Answer / venkatesh

ports enter into the root bridge,these ports are called as
designated ports.The out going ports which are enter into
the root bridge is known as root ports.The alternative root
for the network is known as blocking port.Which port
overcome the listening,learning,blocking modes is called as
forwarding port

Answer / vinoth

STP to identify the Root Port used by Priority value and mac
address, and designated port calculated by closed port of
root port per link, other ports are non-designated port.

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