I have a PC connected to a port on a Catalyst 2950 (12.1(14)EA1). SPAN or port monitor is not active on the switch. When I launch my sniffer, I see a lot of non-local non-broadcast traffic...traffic between two other hosts on the subnet.
When a switch does not find a MAC address of a machine, does it simply broadcast the packet to all ports? We have a pretty big VLAN (it's a /22). I'm just wondering if a switch forwards traffic to all ports if the destination mac address is not yet found.
Thanks!
James