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One of the key concepts of switching and routing is the usage of a virtual Local Area Network a villain.

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Imagine that you have a local area network that consists of a switch and different stations that are

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connected to its port.

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This kind of phone network is considered to be a one broadcast domain every frame that is being sent

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in the network is being broadcasted all over to every member that is connected to the switch in your

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home network one broadcast domain may not be an issue but on large networks where you have dozens and

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hundreds of devices that are members of different divisions that is marketing division finance division.

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You have to use virtual alliance you have to split your network into different broadcast domain.

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It makes your network much more secure and much more efficient because fewer devices receive unnecessary

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packets.

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You can configure your villains either on transparent mode 48 or on a that mode following it.

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Once you do it your ports are becoming a trunk port that is a port that is capable of delivering packets

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from different domains and not only the domain that was configured initially on the physical interface

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so let's move over and create some villains.

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And in that way we will understand the usage much more clearly.

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Let's head over to our network interfaces and currently we have two interfaces that one is connected

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to the marketing division.

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The second one is connected to the finance division.

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Now that interface is also connected to a switch in our marketing division where everyone is connected

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and using their desktop computers.

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Now we want to divide traffic that is coming from the marketing employees and the marketing managers.

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We can create another interface or configure another interface to be used only for the marketing managers.

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But we want to do it on one physical port and divide that port into two broadcast to mean the one is

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the broadcast domain of the physical port which is the standard zero for dot 1 and another one will

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be created using a feeler so let's name our interface.

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Name is one hundred and ten less idea.

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Let's use the eye tag of far veal and also one hundred and ten and let's use the marketing managers

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as our alias.

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Now we'll use the 10 0 0 0 5 1 IP address on the 24 subnet mask

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all right.

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So already use it.

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So let's do this six dot one.

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All right now we will also use a DCP server let's enable administration access using H2 P S and H DTP.

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All right.

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Once we do it we can see that on the internal one interface we have actually created another broadcast

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domain which belongs to the marketing manager that villain has the I D tag of one hundred and ten.

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And now on our switch we can configure Vila.

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It doesn't matter if it's a system switch or an HP switch we can configure a villain on the ports that

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are connected.

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To the marketing managers and desktop computers.

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Once we can figure out feel and own debt port a feeling that belongs to the 10 dot 0 that's 6 that's

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0 subnet which is our broadcast domain.

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Any traffic that will come from our marketing managers through that switch will head over only to the

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new villain that we have created and now we actually have to broadcast domain to secure networks that

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are divided but they are logically exists on one internal interface.

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Now our interface once we configure and you Vila has become a trunk interface.

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It will deliver all the traffic that comes through that internal one interface all the native traffic

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and that's why we say that the native traffic is the native of Vila but also the traffic that comes

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from the second broadcast domain that we have just configured which belongs to the villain one hundred

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and ten.