So let's have a look at the router.
Now don't forget that a router needs to be turned on.
You need to switch it on and then it will boot up and you'll have access to the console.
So again this interface is showing down on the switch because we need to enable the interface on the
router. So the router has booted up show IP interface brief.
I'm gonna go on to gigabit 00 or in this case gigabit 0/0/0 and no shut the interface and
then I'll do the same on interface gigabit 0/0/0 I'll no shut the interface, interface has come
up. Now a router when it boots up for the first time will have a name of router this router has a name
of Internet router so that was previously configured.
Notice the interfaces are now green.
So when I go back to the switch we can see that the interface came up so show IP interface brief we
can see that these interfaces are up
other interfaces are down, VLAN 1 is administratively down.
Now if you don't want to spend time doing this then don't
but in the real world, it's best practice that you shut down
interfaces that are not in use.
So we're gonna shut down interface gigabit 1 0 4 up to 1 0 21, so to 21 will be shut down.
So do show IP interface brief will show us our interfaces.
There's the show command these three interfaces are up other interfaces are now down interfaces gigabit
1 0 22 23 and 24 are up.
That's great.
These interfaces are down, so interface gigabit 1/1/1 to 4 and I should use a range
again.
Shut those interfaces down, so show IP interface brief we've administratively shut down all the physical
interfaces on the switch. So let's configure the access switches.
Here's access 1 show IP interface brief various interfaces are down the interfaces that need to be up
are 3 and 23 and 24.
Now it's especially true on a access switch that you shut down unused interfaces.
Otherwise, someone could simply plug themselves into a wall socket and get access to your network.
In other words, they could plug their computer into any network port that's open we need to shut down gigabit
1 0 4 to 22.
So if we have a look at that switch again show IP interface brief all the unused ports are shut down
remaining ports are gigabit 1/1/1 to 4 shut them down.
Now you may want to write a script to do this to save you time especially when you've got switches
that are using the same ports in the same way as with switch one only port 1 and port 23 and 24 are up.
Now notice something interesting on this switch port gigabit 1 0 3 is up whereas in the diagram it's gigabit
1 0 1.
So that's probably an issue in the packet tracer network, so I fixed that
we can see that interface gigabit 1/3 is now down but that means that we need to enable
this port and disable this port. In the topology that I've made available I'll fix that mistake so that
you don't have to encounter this problem.
Show IP interface brief in the real world diagrams may be incorrect. Okay, so that looks good.
We can do something similar on access 2, so on access 2 interface range gigabit
1 0 2 to 22
that should be shut down.
So again show IP interface brief gigabit 1 0 1 is up.
Other interfaces are down 23 and 24 are up.
That's good interface range gigabit 1/1/1 to 4, I'll shut those ports down.
So show IP interface brief those ports are also shut and I'll save the configuration. Last switch to do
is switch 3 show IP interface brief gigabit 1 0 1 is up 23 and 24 up.
Why are we doing this?
It's for security reasons you don't in a lab have to do this but it's best practice.
So in other words it's good practice to do this in the real world.
In a lab, you may decide that it's not necessary for the exam do what they say.
So in the CCNA exam follow the instructions that you're given.
Don't improvise do what they say.
So that interface is up other interfaces are up.
I'm gonna save the configuration, so we've now successfully shut down unused interfaces.
The next step is to configure, enable and VTY passwords of Cisco.