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Old 7th Mar 2006, 19:44   #1
Joined: Jan 2003
Posts: 11,233
VLANs - advantages and disadvantages?

I've got to write 750 words about the advantages and disadvantages of using VLANs, based on this scenario. As i dont really know what they are, it's pretty difficult! Can anyone lend a hand?
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Old 7th Mar 2006, 20:40   #2
Wise Guy
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Location: Preston, Lancs
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basically vlans are just virtual representations of a logical network. Imagine you have 3 depts, sales, finance and HR. In each you have 20 pcs. Those PCs go into 3 switches. Those switches can share VLAN info, but you have to set up trunking between them. The management decide to move everyone around rather than have each department on one floor, you have 3 departments spread randomly over three floors.

As it happens, sales do a lot of file sharing and clog up the network. You could stick all of sales into a VLAN, basically a broadcast domain, and no one elses traffic would be affected by their bandwidth hogging antics.

Finance have issues with security, so you can stick them onto a different VLAN. HR only access one other server, so you could create their VLAN to limit the amount of hops their traffic has to travel. You can set it based on switch ports or MAC addresses.

Remember VLANs being broadcast domains require routers to enable communication between VLANs. A layer 3 switch can route.

VLAN 1 always exists.

In summary, VLANs are good for bandwidth restrictions, security (Access lists), broadcast and traffic management, and people/depts with specific needs.

Hope that helps, thats all i remember from my ccna studies

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Old 7th Mar 2006, 20:54   #3
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If you have a specific question, then feel free to ask - but we wont do your homework for you.

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