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This is one of multiple IP addressing and submitting scenarios rather than just working out the subnets

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for a scenario.

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We're going to work them out and then configure the devices so that we can practically design and configure

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a Cisco IP network.

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So we've successfully configured this subnet.

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Now we need to configure this subnet and this gets a little bit more interesting because it's 1 9 2

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1 6 8 1 64 slice 26.

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So we already know what the subnet address is.

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Now we need to work out what the first host addresses.

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So what is the first host for the network

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now to work out to the first host.

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You make the host portion zeros except for the last but which is set to 1.

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But to work out the decimal value over here you need to look at the entire octet.

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So this is 64 because that's the network plus one is 65.

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So the first host is 65.

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What does the last host.

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The easiest way to work that out actually is to do broadcast first and then work out the last host.

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So for the broadcast what we do is we fool the host portion with binary ones.

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So what is that.

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It's 255 less 128 which is 127.

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So the broadcast address is 1 9 2 1 6 8 1 127.

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Now the last host is one less than the broadcast address.

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So for the last host we set the host portion two binary ones except for the last but.

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So what does that equal to that's equal to 126.

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So let's assume that we configure the right over the last IP address in the subnet and then we going

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to enable DHP on the router to allocate IP addresses to the hosts.

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So you just wrote it to on the fast ethernet interface I'm going to shut the interface and then I'm

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going to configure an IP address as we worked out 1 9 2 1 6 8 1 1:26.

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And then we need to specify the subnet mask 2 4 5 2 4 5 2 4 5 1 2 second we paying

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our local address.

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Yes we can.

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Now for host allocation let's use DHP.

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So it create ADHD the pool with a name New York and here we need to specify the network.

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So what is the network it's 1 2 1 6 8 1 64.

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And here we have an option we can either use slushed 26 or the dotted decimal notation.

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So let's use Sajda or flush 26 do show run will allow us to see our configuration.

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So that's what we've done in the DHP pool.

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Now we need to configure a default gateway.

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So our default gateway is going to be 1 2 1 6 8 1 1:26.

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There are other options that we can specify in DHP such as DNS server.

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And in this case let's set the DNS server to the local rodder in the real world you probably have a

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separate DNS server.

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So show run

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this the DHS people that we've configured we've configured the default gateway or default router and

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DNS server now in the hosts.

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Let's see if they get IP addresses

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so on the hosts we are going to configure them to use DHP rather than static IP addresses.

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So let's do that on both hosts are both PCs.

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Change them to use DHP.

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And then let's start them up and let's see if they get an IP address from the DHP server.

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Open up a console to both of them.

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So here you can see the first host got an IP address 1 9 2 1 6 8 1 65.

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And the second host got an IP address of 1 2 1 6 8 1 66.

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So can the second host ping the first host.

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Yes it can.

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Will it be able to paying the default gateway.

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Let's try that.

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Yes it can.

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So we've successfully configured the New York site with an IP address on the default gateway and we've

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set up a DHP.

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Now one thing you want to do when you set up a DHB pool like this is specify the excluded address.

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We don't want the DHP server to allocate its own address so we can use the common IP DHP server

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or rather IP DHP excluded address.

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And we can specify a range of addresses to exclude and this example will only exclude local routers

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IP address so we excluded the local routers IP address which means that it won't be allocated through

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DHP.

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I'll save the routers configuration and while we help save Rotto one's configuration

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OK so at this point we've configured both San Francisco and New York.

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The next step is to configure the when connection.

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Now it's inefficient to use a subnet that supports 62 hosts for a network that only requires two.

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But for now lets start off by using the subnet that we allocated.

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And then in a subsequent video I'll show you how to optimize this one.

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Let's allocate to the first IP address in the subnet to the Rodda.

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So that's essentially one more than the subnet address.

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So one twenty nine and one more than that.

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Would be 130

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with subnet mask so what you'll notice is the first IP address is one more than the subnet address and

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the last IP address is one less than the broadcast address so we need to know shut these two interfaces

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and what should happen now is rodder one should be able to ping router to which it can.

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So we've successfully configured the IP addresses on the when and on both landing to faces but to enable

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full connectivity in this network we need to run a writing protocol.

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And in this example all run Joe GOP and enable the GOP on network 1 2 1 6 8 1 2 0.

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Now that is a class full network.

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In other words it's looking at class-C 1 9 2 1 6 8 1 2 0 and not to the subnet addresses on the side

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we'll do something similar.

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Network 1 2 1 6 8 1 2 0 0.

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Disable automatic summarization so that they don't automatically summarize any network's show IP our

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job he never noticed a neighbor relationship is established to write it to.

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And we should see something similar here.

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Show IP IP neighbor neighbor relationship is established to route one show IP route.

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Notice Rotto one has 1 9 2 1 6 8 1.0 directly connected on first.

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Ethan It's 0 0 and 1 9 2 1 6 8 1 128 directly connected to cereal to slash zero.

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Those are the two subnets.

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It's also learnt about network 1 9 2 1 6 8 1 64 from 1 2 1 6 8 1 130.

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In other words to in the same way Rodda 2 has 1 9 2 1 6 8 1 64 directly connected to foster.

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Ethan it 0 0 and 1 on 2 1 6 8 1 128 is directly connected to cereal to slushes 0.

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The Serrato has learnt about a network through choppy from 1 to 1 6 8 1 1:29.

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In other words a 1 and it's learnt about network 1 2 1 6 8 1.0 so wrought at this point should be able

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to ping PC 3 and PC for the pings succeed.

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Now if you remember PCs 3 was allocated the IP address and we can confirm that by using the command

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ifconfig Ethan at 0 is the IP address of PC 3 PC for RDF config.

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Eath 0.

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There's the IP address of PC for so rodder one is able to ping both the PCs now can PC one ping those

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PCs so it can be paying one on to one success said one sixty five.

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Yes we can.

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And 66 Yes we can.

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Let's trace 2 1 9 2 1 6 8 165.

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Notice the trace goes to 1 2 1 6 8 1.

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62 Rato 1.

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Then it goes to 1 9 2 1 6 8 1 130 which is routed to the serial subnet and then it goes to 1 9 2 1 6

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8 165 which is PC 3.

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Be careful.

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These are separate subnets.

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These hosts are in different subnets so that was an example of subsetting.

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We took a network we created subnets we worked up to the subnet address first host address last host

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address and broadcast the address and we configured the network accordingly and then we tested that

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it worked.

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That was a simple example of a practical implementation of subsetting but it's really important that

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you know how to subnet.

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I've enjoyed this video.

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If you did please like it please subscribe to my YouTube channel.

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I wish you all the very best.