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.
00:34
you guys are probably too far away to see. But this switch where my mouse is, the top left 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.
01:32
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
01:53
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.
02:27
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.
03:08
what if we're suspicious that this really is the Mac address
03:13
off the device connected to FAA zeros last 24?
03:19
Router one is connected
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
04:00
zero slash zero, which is connected to switch ones. Fast Internet zeros last 24
04:09
I'm seeing on Router one
04:19
the same Mac address that switch one has learned on Port 24.
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.
05:01
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
05:40
All right, that concludes