Community VLAN or Isolated VLAN (determine type)

Hello,
How to determine if a VLAN should be Community or Isolated ?
I know what they are and do, but not sure how to choose for one to another.
VLAN for students...Isolated or Community ?
VLAN for Teachers...Isolated or Community ?
VLAN for administration...Isolated or Community ?
VLAN for Servers (mail, backup, etc...)
etc...
I am new as a network IT and need some help for a school project.
TOPO:
School = Private VLAN; segmentation = secondary VLANs (Isolated or Community...what to choose ?)....
TY,
Bhastiann

Hi Bhastiann
It entirely depends on your requirements :)
Admins are generally considered to have access everywhere so maybe best as promiscuous.
If the other groups need to connect to each other then they need to be in a community.
Infrastructure generally do, and you could say they are trusted so why not place them in a single community.
If you don't want students to connect directly, place them in an isolated. I'd trust teachers even less :) The method to share files should be by file server.
Don't forget, subnetting and access control. I wouldn't recommend placing all devices in a single subnet. depends on how many you have, but certainly a subnet for end users (teachers, students) and infrastructure would be a good idea.
HTH

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