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Okay so that means I need to configure a rod for the Internet router so do write a full first
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interface serial.
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0 1 0.
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That's this interface.
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Now in the real world you could use commands such as Show CTP neighbors to verify neighbor connectivity.
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If you're not sure how interfaces are connected and you want to verify interface connectivity.
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So this is definitely the local interface connected to the Internet right.
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So on that interface interface serial 0 1 0 IP address 1 9 2 1 6 8 1 1 1 7 first ip address and subnet
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is one more than the subnet address
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and because this is a slash 30 the last IP address is simply the next IP address in that subnet interface
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serial.
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0 2 0 IP address 1 9 2 1 6 8.
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We're in the subnet so it would be 1 1 8 1 1 1 8 slash 30 mosque.
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So can we ping the other side.
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Yes we can and we can see that an SPF neighbor relationship has been established.
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So back on router 4
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we see if neighbor relationship is established.
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We've learnt a default route via the Internet router so IP domain lookup IP name server is going to
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be Google paying Cisco dot com we can ping Cisco dot com can be paying Facebook dot com yes we can solve
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configured the wine links and updated them per the new subnets that we have the next step is to configure
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the subnet so we need to use this subnet for this local area network now the way that you work out first
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host last host broadcast is once again first host is simply the next IP address after the subnet so
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binary it would look like that host portion is set to zeros except for the lost but which is set to
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1 but in decimal it's simply add 1 to the network portion the broadcast would be one less than the next
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subnet so the next subnet is 80 so the broadcast would be seventy nine and to work out the broadcast
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portion youthful the host portion with binary ones
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and again we can verify that we've done a right 79 it looks like this in binary so 0 1 0 0 followed
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by full ones so that's correct and then the lost hosts in the subnet is 1 less than the broadcast address
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so 78 and if you want to work it out in binary you set the host portion to binary ones except for the
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lost but which is set to zero whose portion for subnet looks like that filled with zeros broadcast is
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filled with ones first host is filled with zeros except for the last but which is set to 1 a lost host
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has it fold with ones except for the lost but which is set to to 0 so the lost IP address in the subnet
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which we need to use on router 4 is 79.
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So 1 9 2 1 6 8 1 79
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so on the Ethernet interface connecting to the switch gigabit 0 0 0 IP address 1 9 2 1 6 8 1.
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And again it should be 78
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subnet is a slash 28 so slash twenty eight equals eight plus eight plus eight
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plus one two three four binary ones
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so it's 2 5 octave 4 5 4 binary ones in an octet would look like that followed by four zeros which gives
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us to forty so this is 240
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if you want to verify it again in our calculator to looks like that
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switch needs to be configured with the
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second lost IP address I didn't do that here but it's essentially one less than the last IP address
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so the switch needs to be configured with 77
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so quantity interface VLAN 1 IP address 1 9 2 1 6 8 1
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77 slash 28 can we paying 1 9 2 1 6 8 1 78 so can the switch ping the router make sure that I've done
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it writes a show IP interface brief
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switch should hopefully be able to ping itself.
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Camping itself.
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Let's see if we can ping the rod again
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on the rod US show IP interface brief can we ping ourselves can we ping the switch
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now notice the switch has some old configuration on it.
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So that may be causing problems sometimes in packet tracer when you make changes things break you may
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have to restart packet tracer let's just make sure that I haven't done something dumb that all looks
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right that all looks right shows GDP neighbor details we can see the Internet router
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we can also see the switch with the correct IP address
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the local port is this port another side is that on the site shows GDP neighbors we can see the router
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on gigabit 1 0 1 that looks good let's see if I've done something wrong what I want to do at this point
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is save packet trace and started up again and see if that solves the problem otherwise I'll check if
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I made a mistake packet tracer has booted up again here's the router
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a for show run just to confirm that this IP address 1 9 2 1 6 8 2 1 78 slash 240 is configured on the
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router
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and on the switch switch 3
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show run this IP address 1 9 2 1 6 8 1 seventy seven slash 28 is configured on the switch that's the
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second lost IP address so ping 1 and 2 1 6 8 1 77 switch camping itself cannot ping the router
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still having problems
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I'm going to remove this default gateway command.
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Change it IP default gateway
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190 1 6 8 1 78.
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Let's see if that solves the problems
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and it did on the real world.
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That's not correct in the real world.
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You don't need a default gateway to access a local device but that's a problem in packet tracer.
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So the issue here was the switch wasn't working.
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A real switch in the real world you wouldn't have to do that even though the default gateway is wrong
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because they are on the same subnet.
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They would still work.
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In other words it still be able to ping each other.
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Can the switch now ping Cisco dot com.
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Now I've rebooted Packet Tracer so it may take it a while to sort itself out packet Trace is great.
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But it does sometimes do things that are not real world and sometimes has weird issues but at least
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it gives us the ability to test things and to learn.
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Okay so the switch can now ping Cisco dot com.
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So that's good.
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We have IP connectivity from the switch to the Internet.
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We then need to configure the pieces with the first ip addresses in the subnet.
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So on the P.C. Foster Ethernet a zero interface.
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1 9 2 1 6 8 1.
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IP address is going to be 65 first ip address in the subnet.
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So 65 subnet mask is 2 4 5 2 4 5 2 4 5 240 default gateway is gonna be 1 on 2 1 6 8 1 78 DNS server
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is going to be Google.
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So hopefully this piece he should be able to ping Cisco dot com which it can and hopefully should be
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able to browse to Cisco dot com which it can.
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And what about Facebook dot com.
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You can also browse to Facebook dot com so that works well.
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Next P.S. IP address is going to be statically configured 1 9 2 1 6 8 1 to be 66 next IP address in
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the subnet 2 4 5 2 4 5 2 4 5 2 40 default gateway is going to be 1 on 2 1 6 8 1 78 so can it ping Cisco
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dot com spelled that wrong
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can't find the domain name let's just check that I configured the DNS forgot to do that.
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So DNS needs to be configured it can ping Cisco dot com cannot get to Cisco dot com yes it can.
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Can it get to Facebook dot com.
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Yes it can.
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And then the lost P.S. In that subnet needs a static IP address of 1 9 2 1 6 8 1 67 2 4 5 2 4 5 2 4
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5 2 40 default gateways 1 9 2 1 6 8 1 78 DNS server is Google we should be able to paying Cisco to com
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which we can and hopefully at this point will be able to browse to Cisco which we can and browse to
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Facebook dot com which we can.
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So I've successfully completed this lab.
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I've taken the subnet and broken it up into as many subnets as possible each having 8 hosts per subnet.
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That's what we did there.
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Then I took the last subnet and subnet ID it again and used these two subnets for the one links.
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Notice we still have these two subnets available and these two subnets available so we've conserved
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IP addresses in our network rather than using a slash 26 which is very wasteful.
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On a when link we using slash 30s on two one links and we've used one of the subnets for a site and
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we've got more spare.
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So what we should do is subnet this one as well.
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So what you would do in the real world is make this a slash 30 and better utilize your IP addresses
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but that's okay for this lab.
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I've completed the slab.
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How did you do.
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Were you able to complete the lab yourself.
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IP subediting is really important for the CCMA exam.
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Make sure you understand how to use a variable length subnet mosques are like I've done here.
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Make sure that you understand how to subnet and how to allocate IP addresses to devices in subnets.
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