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In the previous video, we have done configuring
port security on the switch 1.

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Next in this video, we are going to do testing.

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So first, let’s configure an ip address for all
server and pc.

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Here let’s say the ip address is 192.168.1.1, in this case, we don’t need a gateway, because all of this computer will

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be in the same block subnet, remember that we
need a gateway if we want to communicate with

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others computer in the different block subnet.
So in this case, we don’t need a gateway.

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Next, let’s configure the ip address for server 2.

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Desktop, ip configuration, and the ip
address is 192.168.1.2. Next server 3,

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the ip address is 192.168.1.3, and last
for the pc, the ip address is 192.168.1.4.

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And here for the hacker computer, let’s change
the name,

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and the ip address is 192.168.1.5.

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Now let’s test the communication between
all server and pc. Server 1 to pc,

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success, server2 to the pc,
success, and server3 to pc,

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this is also success. So now communication
between all server and pc is ok.

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Now let’s test the port security on fa0/1,
we can unplug the cable from server1,

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and then connecting the cable to the hacker.
Now let’s try to send packet from hacker,

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okay here we can see that now the interface is
red, this is means that the interface is shutdown.

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Let’s check in the switch, do show
port-security interface fa0/1,

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here we can see that now the
status is secure shutdown,

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Okay now let’s say we know about the hacker,

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so we run to the data center and plug
the cable back to the server.

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Okay here the problem is the interface is
still shutdown even we already plug the

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cable back to the server 1. The question
is, how we can enable this interface?

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Let’s try it, go to interface
fa0/1, let’s try no shutdown.

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Here we can see that the interface is
still shutdown. The light is still red.

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So we can not enable the interface
using command no shutdown.

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Let’s try again, no shutdown, here
the interface is still shutdown.

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So what is the right command?

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To enable the interface shutdown by port security
like this, we need to use shutdown command first,

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and then no shutdown.

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Okay here we can see that now the interface is up.

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So remember, we need to shutdown the
interface first, and then no shutdown.

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Now let’s check again, do show
port-security interface fa0/1,

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here we can see that now the status is
secure up. So now server 1 is up again.

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I think enough for this video

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Thankyou for watching and see you on the next video