Time
15 hours 34 minutes
Difficulty
Intermediate
CEU/CPE
16

Video Description

Cisco IOS Lab (part 1) This lesson discusses how to operate and navigate the Cisco Operating System and how to correctly use each of its different modes. You'll learn the three different types of memory a router has, what RAM configuration is most volatile and when, what configuration file the start-up loader loads upon start up, and what role Flash RAM plays in your routers function.

Video Transcription

00:04
Now we will move on to the part of the class. Well, I will show you how to operate and navigate the Cisco operating system.
00:13
Progress any further without having covered that will cost issues. So we need to at this point because the need has a rosen for me to show you how the operating system works, what the different modes are.
00:28
So I am going to go ahead and log into
00:32
router one. But just by clicking
00:34
on Router one
00:38
and I have previously erased everything that existed on Router one.
00:45
So
00:46
there are three types of memories that a Cisco router has.
00:54
The 1st 1
00:56
is your
00:59
the 1st 1 is your ram.
01:02
For your random access memory,
01:06
your ram holds what is called the running configuration
01:11
or the current configuration as it exists on the router or the switch.
01:18
So the first time from memory is your random access memory, or your ram, and it holds the running configuration. The running configuration, once again,
01:26
is all the configuration that you have currently done
01:30
on the Cisco device.
01:33
Now Ram is wall. It'll
01:36
which means a ram will not survive a power cycle. So
01:42
if you have done a bunch of configurations on your Cisco device, and you haven't saved them.
01:49
They're just sitting there on the router right now in Ram. In the present moment,
01:53
they are volatile. So if some reason the electricity goes off or the router reloads or the switch reloads, your configurations are gone.
02:01
That configuration is called You're running configuration running, as in
02:07
what is available or what you have done on the router or switch. Presently,
02:12
the second type of memory Cisco Router has is your envy ram
02:17
or your non volatile ram.
02:21
Your envy RAM holds your start up configuration or your start of configuration file.
02:28
So for whatever reason,
02:30
if you save if you have saved your work from your running configuration
02:37
to your startup configuration, that's what I mean by when I say When you save your work, you copy the contents off your running configuration to your startup configuration or your envy Ram. You have saved your work
02:49
envy. Ram is non volatile,
02:51
so for whatever reason, at the end of the day, if you turned off your outer and went home as long as you have saved your work to envy RAM from running configuration to start up configuration. When you come back in the morning the next morning and you power cycle the router or you hit the on start button,
03:07
your configuration will be loaded as it was left the day before. The startup configuration is the file. The router loads upon startup.
03:16
The last type of memory that the router has is your flash memory.
03:22
Your flash memory holds your operating system
03:27
Now. For Cisco, the operating system is internetworking operating system. The name of the operating system is internetworking operating system or abbreviated to IOS,
03:40
Which is why a little tidbit
03:43
Apple
03:44
cannot use
03:46
a capital I OS for their products.
03:49
The used up
03:51
used lower case
03:53
anyways. So when you have a wiped clean router, which means the startup config has been wiped clean, there's nothing in memory or it is a brand new router.
04:04
When you power cycle it up or when you turn it on, you hit the on button.
04:12
It goes
04:14
to this wizard, which is called
04:16
the initial configuration dialogue or system configuration dialogue,
04:21
and it asking me a question. It is asking me. Conflict continue with configuration dialogue.
04:28
Let's see if I have what happens If I say yes,
04:32
it asked me, Would you like to enter basic management? Set up?
04:38
Okay, let's go ahead and say yes.
04:41
It asks me. Enter hosting.
04:45
Basically,
04:46
this is a wizard that walk me step by step
04:49
and help me do real basic configurations by asking me a Siri's of questions and having me answered them.
04:59
This is not how we want to learn to configure routers. This is for people that are not taking this class. This is for people that are not sitting in on a C CNN class. Since you guys are,
05:10
we're going to kind of avoid this
05:12
because this takes forever.
05:14
I am going to hit the control C button to break out,
05:19
and now it's his press return to get started. Which means press enter
05:25
and I see a router greater than sign.
05:30
Now this prompt
05:31
on the router or a switch. And right now I'm gonna just keep saying router from now on. But for all Cisco devices, this holds true whether it's the router or a switch or a new adoptive security of plants, which is the Cisco Firewall and Essay.
05:47
This prompt holds the same or the all these problems hold the same for all Cisco devices
05:55
This prompt when you see around it stays router and greater than sign
06:00
is your user
06:03
mode.
06:04
It is called user mode.
06:08
Now user mode has very limited capability.
06:13
We are going to avoid user mode From now on. You are not going to see user mode
06:17
after this section of the class,
06:21
the commands available on the user mode or on user mode, we can use the help feature.
06:30
Now, let me define the Cisco help feature out to you
06:35
If I hit Question Mark the question Marquis
06:40
in rule list
06:41
all of the commands that are available in user mode.
06:48
Now
06:49
let's say I want to look at the show command.
06:56
If I type in the letters S h,
07:01
you see the two letters S H
07:04
make
07:08
the command show unique.
07:11
No other command in this list has the 1st 2 letters H
07:16
So here's the rule,
07:18
the least amount of letters that you have to type
07:23
to make a command unique in Cisco works
07:28
once again the least amount of letters that you have to type
07:31
to make a command unique will work. So I never have to type in the whole command show. I can just leave it at H.
07:42
Now, watch what happens when I hit the tab. Key.
07:46
Here I go.
07:47
It completes the command for me. So
07:50
I could either leave it at S H or I hit the tab key and it will complete the command. For me,
07:58
it's a matter of preference. Some people always are hitting the tacky to complete the command for them. For the purpose of this class, I will be using full command. So I will be making extensive use of the tab key.
08:09
But when I'm doing my own labs at home or for you guys, just the least amount of letters
08:16
that makes a command unique will work. So in this case, I could have just left it at S H
08:22
no,
08:24
If S h I do a question mark or execute a question mark.
08:30
It will show me all the commands that are available that start with the letters S H.
08:37
For example,
08:39
these two commands disable and disconnect our two commands that start with the letters D I or even D i s
08:48
If I type in the letters
08:50
D i s or D I
08:52
and I hit Question Mark. It will show me the commands, disable and disconnect.
08:58
So
09:01
if I type in a bunch of letters and I hit a question mark
09:05
immediately after the last letter, it will show me all the commands available that start with those letters.
09:13
No
09:16
going back to show
09:16
instead of hitting question Mark right after show because the only command available with the letters S h o W in the beginning is the only command available is show.
09:28
However, if I say space
09:31
question, mark it
09:33
now
09:35
it is showing me all the commands that come after the word show.
09:41
It is showing me all the commands,
09:45
all the sub commands for the command show.
09:48
So if I say show, let's say sure, let's keep it simple.
09:54
Show clock and I hit Enter the dates wrong
09:58
because the clock on this virtual device has not been set. But it will show me the clock.
10:03
If I say Let's see what else will work.
10:09
Not much. We have done show interfaces.
10:15
It will show me all the interfaces that are available on the router, and I will be going through these commands soon enough.
10:22
No,
10:24
as I said User mode. You can't really do much other than
10:28
we're going to be doing
10:31
some basic level commands from a mood above this. So we're not really going to return to user mode.
10:37
Um,
10:39
so this is the last time you're gonna be seeing user mode in this class.
10:43
We're gonna move up a mode and we're gonna type in the command
10:48
enable.
10:52
Now,
10:52
when you type in the command, enable
10:56
you see a prompt change
10:58
to the pound sign.
11:01
This is called the Privileged Mode or the privilege mode.
11:07
Some people call it the enable mode I might slip up might. I will try not to and call it the enable moored at some point, but enable mode privilege mode prove mode are all synonymous. Officially, it is called the privilege mode.
11:22
Now, the reason it is called privilege mode. And again, this little tidbit is not part of C. C and a little bit more information than you need
11:28
when you when I just type in enable enter,
11:33
it takes me to enable level 15
11:37
which is super user, and I have all the privileges
11:41
enable level one through 14.
11:43
I don't think packet tracer will do it, but
11:46
it does do it so enabled. One through enable 14 are configurable.
11:54
I want to stay in 15
11:56
so enable 1 to 15. 14 are configurable.
12:01
So if I have a bunch of people working for me,
12:05
I, as their boss can assign, enabled Little's enable levels to each one of my employees and one day log into the router using the user names and passwords. Let's say a certain employees. John uses his user name John and password Cisco and logs into the router.
12:24
He will go to enable level, Let's say 14
12:26
and enable 14. I have only given certain privileges. I have set it up so that enable 14 can only execute
12:33
so many commands This way. I have assurance as his boss that he can't use a command to mess stuff up really bad.
12:43
This is just assurance for me,
12:45
But as far as we're concerned for this class, we're just gonna type in enable
12:50
or e n will work just fine and hit Enter and that will take us to super user, which is enable 15.
12:58
Now,
13:01
for the purposes of our class, we are for the most part going to do some show commands.
13:07
So show space question mark will show you the listing of all the show commands.
13:11
And I can use the space Bauer to scroll through these commands.
13:15
And as you see, the options all of a sudden are a lot more extensive than they were in user mode.
13:22
So improved mode. You get a lot more options
13:26
if I just knew. Question Mark. You see, I have to school once, as in user mode, I only had maybe 12 or 15 commands were here. I have a lot more options.
13:39
So
13:41
the commands that we're going to be doing for the most part from our privilege mode are going to be Ping
13:46
and I will explain what this is later
13:50
debug.
13:52
I will also explain what this is later
13:54
trace route.
13:56
Also explain later
14:00
and tell that
14:03
as we execute these commands later on in the class, I will explain what they would they do and what they are.
14:11
As faras configuration goes,
14:15
you cannot actually configure anything from privilege mode.
14:20
You can't do much from privilege mood as faras configuration goes, so we will have to move up one more mode so that we can actually make configuration changes. However, I have to show you
14:31
if you ever wanted to,
14:33
how to get back from privilege mode to user mode,
14:39
and the way we do that is
14:41
the command
14:43
disable.
14:46
If I type in disable and hit enter, you see that I go back to user mode because the prompt changes to the greater than sign.
14:54
Now, remember, I said insist Go to negate a command. All you need to do is put a no in front of the command. Well, this is one of the exceptions to the rule.
15:05
Technically speaking, if they had stuck to their own design,
15:09
no enable should take you
15:13
to use a remote, but it doesn't work that way. You have to type in disabled,
15:16
so I'm gonna go ahead and type in enable and go back to privilege mode
15:20
with the pound sign as my prompt

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