This is an old revision of the document!
VLAN = Broadcast Domain
Great examples with CoS: http://wiki.mikrotik.com/wiki/Vlans_on_Mikrotik_environment
http://blog.butchevans.com/2010/02/to-tag-or-not-to-tag-that-is-the-question/
http://forum.mikrotik.com/viewtopic.php?t=24352
http://networkingforintegrators.com/2012/12/mikrotik-basic-vlan-example/
http://berbagitulisan.com/?p=9
https://vanachterberg.org/2011/09/per-vlan-pptp-with-routeros-and-mikrotik/