@Sergei-0 said in What is VLAN, why and how:
What do I risk? Do I manage firewall to each VLAN? Perhaps I need some links to good introduction materials.
Like all other things you may be false configurating.
If you have enough LAN port you may be connect devices there directly, if not you may be connect
a switch to one or more ports, but if it comes to
something like WiFi let us say you may be able to
set up multiple SSIDs and on top each in its own VLAN, so they are running all over one LAN port
but being separated each from another.
I would say if enough port are there you should go buy routing and firewall rules, if not or it comes to WiFi with several SSIDs you should
take VLANs for it.
VLAN Configuration