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Full Discussion: VLANs and their domains
Special Forums IP Networking VLANs and their domains Post 302907504 by jim mcnamara on Saturday 28th of June 2014 07:34:10 PM
Old 06-28-2014
You can create VLANs,not for common communication, but to isolate layer-2 communication from other network objects. Security.

Example:
If I am on VLAN A I may not be able to ssh over to VLAN B. A lot of places will do this with development versus production servers. Code librarians work on VLAN C with access to A and B. DMZ's are another possible example of isolation at the layer-2 level. Layer-1 isolation is the same idea. If bad guys cannot see network object at all it cannot be attacked. Air gap attacks notwithstanding.
 

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