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In the previous video we already learn how to find
Network IP and Broadcast IP.

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Now in this video, we are going to learn the last thing, which is Range IP.

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But before we start learning about Range IP,  first we need to determine which
block subnet we are going to use.

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In this case, we are going to use the
first block subnet, which is 0 until 127.

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Okay, now you need to remember that Network
IP and Broadcast IP can never be used.

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Let’s say we want to configure the IP
Address of computer as 192.168.0.0,

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pay attention here that 0 is the
Network IP. So this will be failed,

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because we try to use Network IP,  and always
remember that Network IP can never be used!

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Let’s try it in the Cisco Packet Tracer. Here
let’s try to edit the IP to 192.168.0.0.

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Okay, here we can see that we have an error message
“error invalid ip for this subnetmask entered”

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Why this happened? This is because 192.168.0.0

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is Network IP and remember that
Network IP can never be used.

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Now let’s try to configure with Broadcast IP, if
you remember our calculation before, the Broadcast

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IP is 192.168.0.127, so let’s configure here
192.168.0.127. Here we don’t have an error, why?

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Because the subnetmask is 255.255.255.0, which
is /24, in the subnetmask 255.255.255.0 or prefix /24

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127 is not broadcast, but the broadcast
is 255. This is why we don’t get an error here.

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Now let’s edit the subnetmask to
255.255.255.128 as our calculation before.

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Okay here we get an error now.

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So always remember that Network IP and Broadcast
IP can never be used. So which IP that we can used?

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The IP that can be used is after Network IP until
before Broadcast IP. And this is called range IP.

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So range IP is the IP that can be used.
In this case the range IP is 1 until 126.

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And remember that this number will
replace the last number in the IP Address,

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so the Range IP is 192.168.0.1
until 192.168.1.126.

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Okay, now we are done learning subnetting in the
first case. We have learned to calculate Total IP,

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Subnetmask, Network IP,
Broadcast IP, and IP Range.

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I think enough for this video, in the next
video, we are going to learn about subnetting again

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with different case. Thankyou for
watching and see you on the next video!