From: Anthony J Sequeira (asequeira@internetworkexpert.com)
Date: Wed Oct 15 2008 - 20:01:36 ART
The first reason typically given is scalability. This is due to the fact
that with VLANs we can break the network up into smaller, more manageable
broadcast domains (TCP/IP subnets).
When you replace your hubs with switches and setup your workstations for
Full Duplex operation, your network has just become incredibly more
efficient. This is due to eliminated collisions as each system is now
intelligently having its traffic forwarded to the correct unicast recipient.
The problem that still remains, however, is broadcast traffic. The more
switches you add, and the more clients that join the single VLAN, the more
broadcast traffic becomes an issue. VLANs allow us to carve the single
broadcast domain into multiple broadcast domains. This gives us a
scalability solution for broadcast traffic as well as unicast.
I hope this helps you...for more generic information on the wonders of VLANs
- check out -
http://en.wikipedia.org/wiki/VLAN
Warmest regards,
Anthony J. Sequeira, CCIE #15626, CCSI #23251
Senior CCIE Instructor
asequeira@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Outside US: 775-826-4344
On 10/15/08 6:49 PM, "nouman abbasi" <abbasi.nouman@gmail.com> wrote:
> Hi,
>
> Why do u use VLANS ??
>
> Most common answer is Security / Broadcast Domain ??
> can some add more to it...
>
>
>
> Thanks
>
>
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