- [Voiceover] So let's run out to the Corp router again,
my favorite router it seems like, I guess
and we're gonna log in and run through some commands
to look at our configuration.
Once we do that, I can do them from User mode.
Show IP int brief, my favorite command obviously.
So once we run through some of these commands
and learn how to save our config,
and then even erase our config,
which are very important to us, to be able to
both save and erase them or learn how
to not erase our config, actually.
Looking at this output, the interfaces on the left
are what the post test found,
as I've mentioned before, the IP addresses here,
it would be super nice had they listed the mass
on this interface, on this output. But they didn't.
And then the status, our layer one and our layer two.
And the show protocols,
show Proto and we'll see the IP addresses, the mass
and the layer one and two status, that's nice.
One other command I want to show you
and this one I haven't showed you yet,
Show IP Interface. Okay so I'm gonna say f0/0
and we can see all of the IP configurations
the default configuration we don't see
with the show running config.
Right, so we can see things like, at the bottom,
that fast switching is enabled.
Split horizon is enabled. Proxy ARP.
If an access list is set.
There's a lot of information we can get from here.
So, the other thing is, is we want
to look at the configurations,
and the first one we're gonna look at,
using my Tab key, of course,
Show Running-config,
and at the top we can see the iOS version.
So a lot of people don't know they can see the iOS version
from the running-config.
But at the top it says version 15.1.
So if anyone was to ask you on the exam objectives
what iOS version, what commands can you run
to see the iOS version, Show Run
is absolutely an answer, isn't it?
You see our host name, and we can come down
and see service password encryption was configured up there.
Our interfaces, our IP address masks,
I have some routing configured
and then at the end we'll see our passwords
for our lines and notice they're encrypted.
So the other command is our back up configuration.
Notice it's not present because you actually
have to go and do it, there is no configuration by default.
So I can type out Copy Run Start.
Now I can use my Tab key and type them all out
but I'm relatively lazy when it comes to that.
Notice I verified my name before I pressed Enter.
And now my configuration is copied over,
So I do Show Start now, using my Tab key
so you can see the whole command
I can see that my configuration is there,
also how much space I'm using in my NVRAM
on my very first line.
And then my iOS version is listed there as well.
And then the rest of the configuration would be the same.
There is another command, an old command
just WR stands for write mem
and if I did that, that's the old Copy Run Start.
Not in the exam, but very helpful
when in your test environment at home
and you're in kind of a hurry to save your configuration.
Now that we've built a configuration
and saved it, let's destroy it.
The way that you get rid of a configuration on a router
and set it back to factory defaults is Erase Start.
Now, notice I typed out and used my Tab key,
if I just did Erase Start, that's the short cut
that should work, but it's not going to.
So it says Incomplete command.
It makes you type this out, like if you're going to do this
you better mean it, or something.
Anyways, so we're going to go ahead and confirm that
and erase the startup-config.
So if I did a Show Start, I'm going to see
that the startup-config is not present now.
So if I reload and press Enter
it's gonna take me back to do factory defaults.
I'm gonna press Q key because I wanna save,
I like my config right now.
So since I'm in love with this configuration
let's go ahead and Save it again.
Copy Run Start or we could use our new found command
our simple one, just WR + Enter
and now I'm at happy hour.
I could've been happy hour for I like my Sprite.
Alright to be fast and efficient I'm just gonna type
WR + Enter and understanding that is not
the exam objective I'm just being lazy here.
And saving my config at the same time.
So to view the configs, erase the configs
all very simple, practice these so you don't make
any mistakes in your production network.