Virtual Lan meaning in simple words

mgnidhi_3july · 05-06-2010, 11:55 PM

Hi all,
i'm new to network,can any one tel me in simple words what exactly Virtual Lan means? and whats the use of having it in network?

thanks and regards,
Sri

tkmsr · 05-07-2010, 12:31 AM

It simply means having a small pipe inside a larger pipe.

mgnidhi_3july · 05-07-2010, 01:08 AM

hop these kinds of answers will not resolve any kind of doubts.If you also dont know then need not to reply for questions...

Quote:

Originally Posted by tkmsr

It simply means having a small pipe inside a larger pipe.

tkmsr · 05-07-2010, 01:13 AM

Quote:

Originally Posted by mgnidhi_3july

hop these kinds of answers will not resolve any kind of doubts.

What is the doubt.IMHO RTFM.

giammy · 05-07-2010, 02:31 AM

Quote:

Originally Posted by mgnidhi_3july

Hi all,
i'm new to network,can any one tel me in simple words what exactly Virtual Lan means? and whats the use of having it in network?

thanks and regards,
Sri

Hi,

suppose you have 3 PC for the administration office and 3 PC for technical office: you tipically want to connect to the network the 3 PC of the administration office and the three PC of the technical office, but do not want that technicians connected to the administration office and vice versa.

So you need 2 separate switch and to installa 2 physycally separated local networks.

If you use 1 switch and virtual LAN (VLAN), you create 2 VLAN, ADMINISTRATICE and TECH, and connect the PC accordingly.

The 2 LAN are logically separated. the PCs in the 2 VLAN cannot communicate, and you spend less money (and you can change the configuration when you want!)

bye
giammy

tkmsr · 05-07-2010, 04:02 AM

may be you should try this.

scheidel21 · 05-07-2010, 08:28 AM

A bad ASCII visual representation for explanation

Code:

ISP----Modem----Switch--------VLAN 1 (192.168.100.0)--------Admin computers
                         |
                         -----VLAN 2 (192.168.3.0)---------Tech computers

VS.

ISP----Modem---Physical ETH0----Switch LAN 1 (192.168.100.0)-----Admin Computers
            |
            ---Physical ETH1----Switch LAN 2 (192.168.3.0)-----Tech computers

In example one we have a switch that supports VLAN which allows us one physical switch, we assign specific ports say 1-5 are on VLAN 1 which is 192.168.100.0 subnet then we assign ports 6-10 to VLAN 2 which are on 192.168.3.0 subnet. Then VLAN 1 computers cannot talk to VLan 2 computers unless we place a router between the two subnets. We might do that if we wanted http access between the LANS but nothing else.

In example two we do not have a VLAN capable switch, this requires us to have two seperate switches. One for LAN 1 and one for LAN 2.

VLAN technology is nothing more than Virtualization of switches. Allowing for increased ROI by minimizing the hardware requirements yu need to purchase for your needs.