I'm find an explanation of one issue face in our network. We have a part of our network which is not segmented.We install a sniffer server without configuring span, this sniffer server was connected to the cisco switch.
We discover that this sniffer is able to see tcp &snmp traffic between PRTG server and remote equipment monitored via snmp.
I'm confused, because i do not know why a unicast traffic can be received by sniffer. Please, can you know the different reason of this behavoir and how to avoid it ?
Thank you & Best regards.