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In the previous video, we already learn about
what is vlan and why we need to use vlan.

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Next in this video, we are going to practice
about vlan.

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This is topology that we are going to use
to practice vlan.

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I already configure the ip address of pc 1
pc 2 and pc 3, but not for pc 4.

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Now let’s configure the ip address of pc 4,
so the ip address is 192.168.1.4.

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Let’s make sure the ip address of pc 1, okay
the ip address is correct.

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Pc 2 also correct, and pc 3 also correct.

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Now let’s try to ping from pc 1 to pc 2, here
let’s go to simulation mode first.

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And here let’s ping or send packet from
pc 1 to pc 2.

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Here, pc 1 will send arp packet first.

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Remember that arp packet is used to ask the
mac address of the destination.

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In this case, pc 1 is ask for the mac address
of pc 2.

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Here let’s continue.

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The arp packet is received by switch.

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And then the switch will be broadcast the
arp packet to all pc. But here we can see

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that there is x in pc 3 and pc 4.

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This is means that these 2 pc will not reply
for the arp packet.

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Because the arp packet is to ask the mac address
of pc 2.

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But here we can see that pc 2 will be reply.

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And finally the arp packet is back to the
pc 1.

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After the arp is complete like this, now pc 1
know the mac address of pc 2.

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And then they will communicate with icmp protocol

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Icmp protocol is the protocol that used in
ping.

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Okay finally here we can see that the ping
is success.

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What I want to show you is, that the arp packet
will be forwarded or broadcasted to all pc.

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why?

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This is because, by default, all of interface
in the switch is in the same vlan,

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which is vlan 1.

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Vlan 1 is the default vlan.

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Because all interface is in the same vlan,
so the arp packet will be forwarded to all pc

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Here let’s check it in the switch, to show
the vlan information,

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we can use command show vlan brief.

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Okay here we can see that all of interface
is in the same vlan, which is vlan 1.

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This is why the arp packet will be forwarded
to all pc.

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In the previous video, I already said that
one of the advantage if we use vlan is that

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separation of broadcast domain.

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Now let’s try it.

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We will configure so pc 1 and pc 2 will be in
the vlan 10, and the pc 3 and pc 4 will be in

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the vlan 20.

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Actually you don’t need to use vlan number
10 and 20, the number of vlan is between 1-4095,

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so you are free to use any number between
1 and 4095.

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But in this example, I will use vlan 10 and
20.

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Okay let’s start the configuration, open
the switch.

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Always remember that if we want to doing any
configuration,

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we need to enter global configuration mode first.

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So here let’s type conf t or configure terminal.

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Next let’s create the vlan, vlan 10, and
then let’s set the name of the vlan,

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let’s say the name is accounting. Exit.

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Now let’s verify it first, do show vlan
brief.

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Okay here we can see that we have vlan 10
and the name is accounting.

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Next let’s create for vlan 20.

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And the name let’s say marketing. Exit.

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Do show vlan brief again to verify.

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Okay here we can see that now we have vlan
10 and vlan 20.

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But if we see here, all of interface is still
in the vlan 1.

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There is no interface in vlan 10 and vlan
20.

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So now, we need to assign the interface to
the vlan.

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Here fa0/2 and fa0/3 will be assign to vlan 10,

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And then here fa0/1 and fa0/4 will be assign
to vlan 20.

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Okay let’s start the configuration.

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First let’s configure for fa0/2, interface
fa0/2, and then change the mode to access.

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If you do not know about mode access, don’t
worry,

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I will explain about this later in the next video.

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Okay then let’s set the access vlan to 10.

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This is means that we assign interface fa0/2
to vlan 10, and then exit.

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Let’s verify, do show vlan brief.

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Okay here we can see that now, fa0/2 is already
in the vlan 10.

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Next let’s configure for fa0/3, this will
also assigned to vlan 10.

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So go to interface fa0/3, switchport mode
access and then switchport access vlan 10. Exit.

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Let’s verify again, okay here we can see
that now, fa0/2 and fa0/3 is in the vlan 10.

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Next, let’s configure for vlan 20.

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So here fa0/1 and fa0/4 will be assigned to
vlan 20.

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Go to fa0/1, switchport mode access, switchport
access vlan 20, so here we assign fa0/1 to vlan 20.

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Next let’s assign for fa0/4, here interface
fa0/4, switchport mode access, oh sorry there

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is a typo, so switchport mode access, and
then switchport access vlan 20.

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Now let’s verify it.

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Do show vlan brief.

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Okay here we can see that fa0/2 and fa0/3
is in the vlan 10,

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and then fa0/1 and fa0/4 is in the vlan 20.

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If we have done configuring vlan like this,
now we have 2 logical switch or virtual switch.

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So here we have virtual switch for vlan 10,
and then we also have virtual switch for vlan 20

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So physically, we have 1 switch.

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But logically, we have 2 switch.

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Which is switch for vlan 10 and switch for
vlan 20.

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So now we have separation of broadcast domain.

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This is mean, when pc1 send arp packet, the
arp packet will not forwarded to pc 3 and pc 4,

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but only forwarded to pc 2. Let’s try it.

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But before that, we need to remove the arp
table in all pc. ARP table is the mapping

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of ip address and mac address, is the pc already
have arp table,

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so the pc will not send an arp packet.

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Okay here in the pc 1 still have arp table,
now let’s remove it.

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Okay now the arp table is empty.

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Pc 2, here we have arp table, let’s remove
it, okay now the arp table is empty.

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Let’s check in the switch, in the switch
the name is not arp table,

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but mac address table.

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Okay here there is some entry in the mac address
table, let’s delete it.

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Okay now the mac address table is empty.

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now let’s send packet from pc 1 to pc 2.

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Here we can see that pc 1 will send arp packet.

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Continue, the arp packet will be forwarded
to switch, let’s check it, here we can see

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that the arp packet will be forwarded only
to fa0/3,

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which is the interface that connected to pc 2.

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The arp packet will not forwarded to pc 3 and
pc 4, why?

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Because pc 3 and pc 4 is in the different vlan,
or in the different broadcast domain.

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Let’s continue, here we can see that the
arp packet only forwarded to pc 2.

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Pc 2 will answer the arp packet, and then forwarded
to pc 1.

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After the arp is complete like this, pc 1 will
send icmp packet,

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remember that icmp packet is the ping.

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And now successful,

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Okay I hope you understand.

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For testing again, let’s add one pc again
to vlan 10.

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Here let’s add one pc and then connecting
to the switch.

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Here we can see that the interface is fa0/5,
by default this interface is in the vlan 1,

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let’s check it.

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Do show vlan brief.

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Here we can see that fa0/5 is in the vlan
1.

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Now let’s assign this interface to vlan
10.

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Interface fa0/5, switchport mode access and
then switchport access vlan 10.

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Let’s show the vlan again, show vlan brief,
okay here we can see that now,

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fa0/5 is in the vlan 10.

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So now, if pc 1 send arp packet, the arp packet
will be broadcasted to pc 2 and pc 10, why?

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Because pc 2 and pc 10 now is in the same vlan
as pc 1, which is vlan 10.

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The case is same if we add one more pc, and
then assign the pc to vlan 10,

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so the arp packet will also broadcasted to this new pc.

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Let’s try it.

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Here we can see the interface is fa0/6.

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Let’s assign this interface to vlan 10.

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So interface fa0/6, switchport mode access,
and switchport access vlan 10.

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Let’s verify it, do show vlan brief.

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Okay here we can see that fa0/2, fa0/3, fa0/5,
and fa0/6 is in the vlan 10.

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Now let’s see the arp packet.

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But before that let’s clear the arp table first.

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Here we can see some entry in the arp table,
let’s clear it, okay now this is empty.

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PC 2, here also have arp table, let’s clear
it, okay now this is empty.

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In the switch, here we have some entry in
mac address table, let’s clear it,

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and okay now it is empty.

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Okay now let’s try to send packet from pc 1
to pc 2, here we can see that pc 1 send a arp

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packet to ask the mac address of 192.168.1.2,
which is pc 2.

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Continue, the arp packet will be forwarded
to the switch, here we can see that switch

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receive arp packet from pc 1, and then will
be broadcasted to fa0/3, fa0/5, and fa0/6.

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This is means that the arp packet will be
broadcasted to all pc in the vlan 10.

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Continue, here we can see that the arp packet
is broadcasted to pc 2, pc 10, and pc 11.

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But pc 10 and pc 11 will not reply it.

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The only one will reply this arp packet is
pc 2.

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The arp reply will sent to switch, and from
switch will sent to the pc 1.

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Next pc 1 will send icmp.

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The icmp will be sent to pc 2, the pc 2 will
reply the icmp to pc 1, and this is successful.

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Okay I think enough for this video.

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I hope you understand about vlan.

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Thankyou for watching and see you on the next
video