Introduction to IT and Cybersecurity
Video Description
MAC Address Table Lab For this lesson, we conduct a Lab on MAC Address Table by launching Cisco Packet Tracer to demonstrate how MAC Addressing work and the function of the MAC Address Table. You'll observe the relationships between switch and port assignments, how to locate MAC Addresses and how to determine what objects each MAC Address reference/points to.
Video Transcription
00:04
All right, folks, as you see that the lights have dimmed. I am gonna go ahead. And just instead of talking about what a Mac address table is and what it does, I want to show you guys. So, as you see, I'm opening up a copy of Cisco Packet Tracer.
00:21
And I'm going to center the scroll bars and
00:24
bring up a lab that I have created.
00:27
This is the lab we're going to be using throughout this class to for me to explain topics to you.
00:33
And
00:34
you guys are probably too far away to see. But this switch where my mouse is, the top left one
00:40
is switch one,
00:43
this bottom one
00:45
on the left to switch to
00:47
and then twist three top. Right switch four bottom right
00:52
switch. 123 and four are connected to routers. 123 and router four.
01:02
Now, if I hover my mouse
01:03
over this link and you guys probably can't see it,
01:08
switch around her ones. Fast. Internet 00 or outer ones port fast. Ethernet 00 is connected to switch ones. Fast. Internet zero slash 24 hour in effect, Port 24.
01:23
Once again, I haven't explained the naming conventions Francisco devices yet, but we would have done that by the end of today.
01:30
So
01:32
router ones, fast Internet zero slash here or pork zero slash zero is connected to switch ones. Fast Internet. The FAA stands for fast Ethernet port
01:44
zero slash 24 or in effect for 24.
01:48
Now I'm going to click
01:51
on
01:52
switch one,
01:53
and I'm going to go to the command line interface with CLI. If you can see, it is the command line interface.
02:01
And here we are inside of switch one.
02:06
And don't worry about that e n stands for We will cover that a little bit later today in class.
02:13
But
02:15
if I say show
02:19
Mac
02:21
address table
02:23
and I hit enter,
02:24
you see?
02:27
Don't worry about what this is, villain One. We will learn that later. I'm just gonna point to the fields that are pertinent to you.
02:36
So on Port Fast Ethernet zero slash 24 on the switch,
02:40
you see the Mac address 00605 c 60 c 801
02:49
The type it says dynamic, which means this was automatically learned.
02:53
This word dynamic means that switch one learned this Mac address, so switch weren't learned This Mac address dynamically on Port FAA zero slash 24.
03:07
Now
03:08
what if we're suspicious that this really is the Mac address
03:13
off the device connected to FAA zeros last 24?
03:16
Well, as I said,
03:19
Router one is connected
03:22
to switch
03:24
ones. Fast Internet zero slash 24 arado ones. Port 00 Fast Internet 00 is connected to switch ones. Fast Internet zeros last 24. So let's make sure that
03:38
the Mac address learned on Port 24 on Switch one is actually that over outer ones.
03:46
So I logged into Router one
03:52
and I'm going to look at Interface
03:58
Fast Ethernet
04:00
zero slash zero, which is connected to switch ones. Fast Internet zeros last 24
04:06
and the Mac address
04:09
I'm seeing on Router one
04:11
is 00605 c 60 c 801
04:18
which is
04:19
the same Mac address that switch one has learned on Port 24.
04:27
Now,
04:30
for those of you who are wondering what this b I A stands for, this is the burnt. This be a stands for burnt in a dress so Mac addresses are actually burnt into
04:42
the network interface card offer device with a laser. So the hence it says burnt in a dress and the burnt an address in this case is the same as the configured Mac.
04:53
This can vary. This can change. But for this class, you're going to see that it always remains consistent.
05:00
So once again,
05:01
to look at the devices. Mac address table.
05:04
You do the show. Mac. Address hyphen. Table command.
05:11
These other Mac addresses on port three. Port one and port to
05:16
these are the Mac addresses
05:18
off. Switch to and switch three. We will get to that later. Right now, the only thing you need to remember
05:27
is when you look at a Mac address table on Cisco Device, you execute the show, Mac, address desk, table command
05:38
on the switch.
05:40
All right, that concludes
05:42
the lab section.
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