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So let's have a look at the router.

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Now don't forget that a router needs to be turned on.

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You need to switch it on and then it will boot up and you'll have access to the console.

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So again this interface is showing down on the switch because we need to enable the interface on the

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router. So the router has booted up show IP interface brief.

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I'm gonna go on to gigabit 00 or in this case gigabit 0/0/0 and no shut the interface and

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then I'll do the same on interface gigabit 0/0/0 I'll no shut the interface, interface has come

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up. Now a router when it boots up for the first time will have a name of router this router has a name

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of Internet router so that was previously configured.

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Notice the interfaces are now green.

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So when I go back to the switch we can see that the interface came up so show IP interface brief we

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can see that these interfaces are up

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other interfaces are down, VLAN 1 is administratively down.

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Now if you don't want to spend time doing this then don't

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but in the real world, it's best practice that you shut down

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interfaces that are not in use.

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So we're gonna shut down interface gigabit 1 0 4 up to 1 0 21, so to 21 will be shut down.

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So do show IP interface brief will show us our interfaces.

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There's the show command these three interfaces are up other interfaces are now down interfaces gigabit

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1 0 22 23 and 24 are up.

21
00:02:25,420 --> 00:02:27,220
That's great.

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These interfaces are down, so interface gigabit 1/1/1 to 4 and I should use a range

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again.

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00:02:39,880 --> 00:02:48,330
Shut those interfaces down, so show IP interface brief we've administratively shut down all the physical

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00:02:48,330 --> 00:02:53,150
interfaces on the switch. So let's configure the access switches. 

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Here's access 1 show IP interface brief various interfaces are down the interfaces that need to be up

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are 3 and 23 and 24.

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Now it's especially true on a access switch that you shut down unused interfaces.

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Otherwise, someone could simply plug themselves into a wall socket and get access to your network.

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In other words, they could plug their computer into any network port that's open we need to shut down gigabit

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1 0 4 to 22.

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So if we have a look at that switch again show IP interface brief all the unused ports are shut down

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remaining ports are gigabit 1/1/1 to 4 shut them down.

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00:03:54,670 --> 00:04:00,820
Now you may want to write a script to do this to save you time especially when you've got switches

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00:04:00,820 --> 00:04:20,220
that are using the same ports in the same way as with switch one only port 1 and port 23 and 24 are up.

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Now notice something interesting on this switch port gigabit 1 0 3 is up whereas in the diagram it's gigabit

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1 0 1.

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00:04:34,800 --> 00:04:40,930
So that's probably an issue in the packet tracer network, so I  fixed that

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00:04:44,740 --> 00:04:55,150
we can see that interface gigabit 1/3 is now down but that means that we need to enable

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this port and disable this port. In the topology that I've made available I'll fix that mistake so that

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you don't have to encounter this problem.

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Show IP interface brief in the real world diagrams may be incorrect. Okay, so that looks good.

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We can do something similar on access 2, so on access 2 interface range gigabit

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1 0 2 to 22

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00:05:36,200 --> 00:05:38,160
that should be shut down.

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So again show IP interface brief gigabit 1 0 1 is up.

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00:05:45,130 --> 00:05:49,270
Other interfaces are down 23 and 24 are up.

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That's good interface range gigabit 1/1/1 to 4, I'll shut those ports down.

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00:05:59,490 --> 00:06:08,770
So show IP interface brief those ports are also shut and I'll save the configuration. Last switch to do

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00:06:08,770 --> 00:06:19,220
is switch 3 show IP interface brief gigabit 1 0 1 is up 23 and 24 up.

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Why are we doing this?

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It's for security reasons you don't in a lab have to do this but it's best practice.

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00:06:35,780 --> 00:06:40,620
So in other words it's good practice to do this in the real world.

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In a lab, you may decide that it's not necessary for the exam do what they say.

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00:06:50,830 --> 00:06:56,840
So in the CCNA exam follow the instructions that you're given.

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Don't improvise do what they say.

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So that interface is up other interfaces are up. 

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I'm gonna save the configuration, so we've now successfully shut down unused interfaces.

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The next step is to configure, enable and VTY passwords of Cisco.