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Now we've been told to configure of one with the lost IP address in the that subnet.
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Now this is the subnet that we concentrating on initially so let's start with that subnet.
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The way you work out first.
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Lost and broadcast addresses as follows.
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The network has the host portion populated with binary zeros.
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So notice whose portion is all zeros.
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The first host has the host portion populated with binary zeros except for the lost but which is set
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to a one in binary.
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So that's the first host in the subnet The Lost host in the subnet as the host portion populated with
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binary ones except for the lost but which is set to binary 0 and I'll show you in a moment what that
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is but it's easier to work out the broadcast address first.
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So the broadcast address equals that subnet
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and the host portion is populated with binary ones.
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So it's 1 1 followed by 4 ones.
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Now you can work this out by saying 32 plus 16 plus eight plus four plus two plus one.
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But I find it easier to do the following if this is set to 1 and everything else is set to zeros so
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it looks like this that equals 64 one less than that equals 63.
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So if you asked for something like this what is the broadcast address.
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Have a look at the next subnet and subtract one to get to the broadcast address of the previous subnet.
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The next subnet is 1 9 2 1 6 8 1 64.
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The broadcast address of the previous subnet is that subnet minus 1.
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So in other words it's 63 and then this is 62.
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So for this subnet that's the network and first host This is the lost and broadcast address.
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Second lost which we need for this switch is essentially one less than that can work out the binary
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but it may be easier just to subtract one from the decimal.
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So that's 61.
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And the third lost is one less than that which is 60
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so we now know the network the first host the broadcast the lost host.
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Second lost host and third lost host.
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Easiest way to work this out is to work out to the network and then work out the next network one less
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than the next network gives you the broadcast address for the current subnet and then you can just subtract
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one from that to get to the lost host.
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Second lost host and third lost host first host is equal to the network portion plus 1.
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So they are our values.
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That means we can now configure this router with the lost IP address in the subnet.
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So currently on this router it only has a loop back interface configured it it doesn't have an IP address
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configured on gigabit.
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0 0 0.
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Remember the network 1 9 2 1 6 8 1.0 slash 26 has two bits that are part of the network portion two
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binary bits.
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Looks like that which equals 192.
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So we can configure the gigabit.
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0 0 0 interface with an IP address of 1 8 2 1 6 8 1 62 because that's the last IP address in the subnet.
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So 62 and the mask is 2 4 5 2 4 5 2 4 5 1 92.
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And that's because these two bits are part of the network.
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So we've got 255 255 255 two bits there which equates to 192.
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So show IP interface brief we can now paying our local IP address.
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The switch needs to be configured with the second a lost IP address in the subnet.
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Per these instructions so configure the switches with the second lost IP address and then the DHB servers
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with the third lost IP address.
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So again he has I'll switch
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I'll give it a name.
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Switch one interface of Ilan one no shut IP address 1 9 2 1 6 8 1 and the next IP address that we can
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use is 60 1 2 4 5 2 4 5 2 4 5 1 92.
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So show IP interface brief that's the IP address of the switch can the switch now ping the router yes
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it can switch has been successfully configured router has been successfully configured let's configure
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the DHB server so on the Ethernet interface we going to configure a static IP address of 1 9 2 1 6 8
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1 and the IP address will be 60 in this example third lost IP address subnet Moscow will be 2 4 5 2
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4 5 2 4 5 1 92.
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Now the default gateway will be the router 1 9 2 1 6 8 1 and the Rada once again has IP address 62 so
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62 DNS server and this example will be 8 today to today to date this is the internet DNS server it's
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configured with DNS names for Cisco dot com and Facebook dot com so the server has been configured.
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Can we ping the switch.
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Yes we can.
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What about the router.
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Yes we can.
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So we've configured IP addresses and default gateways on the network devices.
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Now one thing I still need to do on the switch is specify a default gateway which will be the router
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Rod it has IP address 62
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so again the switch can ping the router we've finished configuring the switch now on the DHB server
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we need to configure a DHB pool default gateway is going to be the router 62 DNS server is going to
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be the Google DNS server and we can allocate IP addresses from 1 9 2 1 6 8 1 2 1.
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So from the first ip address in the subnet to a number that we decide.
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So we could as an example allocate 100 IP addresses so I'll save that.
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So we've specified the pull name default gateway DNS server starting IP address in the pool and the
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number of IP addresses that can be allocated now can I specify a hundred hosted addresses the answer
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is no I should actually specify only something like 50 because of the subnet only supports 62 IP addresses
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so remember the formula 2 to the power of something which is the number of but minus 2 gives you the
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number of hosts that are supported in a subnet.
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Yeah we've got six binary bits.
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So two to the power of six.
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That's the number of bits in the WHO's portion what's two to the power of six two to the power four
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is sixteen two to the power of five equals thirty two.
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Two to the power of six equals 64 so 64 minus two gives us sixty two hosts that are supported in a subnet
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but we want to allocate some of those IP addresses to network devices so we don't want to allocate the
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full submit to the DHB server we'll only allocate a portion of the addresses to hosts via DCP so on
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P.S. One does the piece you have an IP address yes it does it's been allocated 1 on 2 1 6 8 1 dot 3
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cannot ping the default gateway yes it can.
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P.S. 1 as an example IP config it's also been allocated an IP address 1 9 2 1 6 8 1 2 2 cannot ping
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its default gateway yes it can and on P.C. to do something similar.
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IP address has been allocated and it can ping its a default gateway so we've successfully configured
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subnet 1.
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Now we need to configure the serial link and then once I've done that I'll check whether these devices
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can access devices on the Internet and then I'll configure the other subnets.
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