Are there network packet sniffers that are able to decipher communication even if the target computer is in another vlan? I mean if a pc with a packet sniffer is on vlan1, can that user view info on vlan2? The reason i am asking is because i read that vlans offer security on packet sniffer software. However, from what i understand, these sniffers could only read communication from computers located within the same collision domain. I couldn't understand how it could listen to a pc on a subnet utilizing a switch. So i guess what i am getting at is - the switch itself is added security and vlans are no longer necessary unless ofcourse there are packet sniffers that could access lan comm. over a switch.
Thanks in advance for any info anyone could provide regarding this.