My Perceive of VLAN’s Goal
Say you handle community for a constructing which leases every flooring to an organization. You need to separate every firm on every flooring to its personal LAN community for higher safety however you do not need to have separate cable traces and switches. That is when VLAN is helpful.
One other time when VLAN is helpful is to interrupt up broadcast area and cut back impact of broadcast storm.
All of those situations are how VLANs are helpful while you need to logically divide LANs on a similar set of gadgets.
Query
This textbook offers how VLAN could be helpful in a reverse state of affairs. The e book urged VLAN may also be helpful in case you want to have gadgets farther from one another to look as if they’re in the identical LAN.
What do you do when you’ve got completely different individuals somewhere else who’re “logically” tied collectively? For instance, for some time the Loyola College CS division was cut up, resulting from building, between two buildings.
One method is to proceed to maintain LANs native, and use IP routing between completely different subnets. Nonetheless, it’s typically handy (printers are one motive) to configure workgroups onto a single “digital” LAN, or VLAN. A VLAN appears like a single LAN, often a single Ethernet LAN, in that every one VLAN members will see broadcast packets despatched by different members and the VLAN will in the end be thought of to be a single IP subnet
Primarily based on the instance from the e book above, to make gadgets in two LANs in two buildings seem as if they’re in the identical LAN, the conventional manner could be to have a change and cables to attach these two LANs. Then all these gadgets will certainly develop into in a similar LAN.
The e book urged VLAN makes this setup simpler. However I’m not seeing how VLAN can obtain this simpler since for VLAN to work, you’ll nonetheless want to attach these two LANs with a change… which successfully turned all of them into a giant LAN.
The one manner I see that VLAN would make this simpler is that if initially, there’s a router between the 2 buildings (not a change) and one way or the other the creator can configure VLAN over a LAN – router – LAN setup (as an alternative of changing the router with a change).
However so far as I perceive, you can’t try this.
So how does VLAN make this simpler?