In this course, we are mainly using Cisco Packet Tracer to simulate networks.
Cisco Packet Tracer is fantastic software.
It allows us to simulate all kinds of networks.
We can simulate routers, we can simulate switches, we can simulate wireless access points, wireless
LAN controllers, all kinds of devices can be simulated using Cisco packet tracer, but it's a simulator.
It doesn't actually show us what's happening in a real network.
It gets us a long way there.
Fantastic software for building virtual networks on your laptop.
But if you really want to see what's actually happening on a network, you need to use something like
Wireshark.
So in this course, I'm going to show you why Shock Captures and we're going to dig deep into the packets.
We're going to look at applications such as HTTP, FTP and others.
I'm going to show you how you can capture passwords off the wire or off the air if you're using a wireless
network.
So basically, Wireshark is what's called a protocol analyzer.
It captures traffic off the wire and allows you to view packets that have been sent by either your device
or other devices.
If you use a mode called promiscuous mode, basically, Wireshark is a fantastic tool that network engineers
use to analyze networks and find out if they're problems on a network.
In this example, it's going to be voice over IP traffic.
In other words, we're going to capture traffic between virtual phones as shown here, as well as virtual
phones and physical phones.
I'm going to make calls between these two phones and then we're going to capture the traffic and then
replay the voice call.
And we're going to use Wireshark for that.
This is my second call.
David Bumble speaking to himself, click play streams.
And there's our voice call.
This is my second call.
David Bono's speaking to himself.
Himself now to make it easier for you rather than you trying to build some of the networks that I've
created in this course.
I've captured the packets in Wireshark and I've attached them to the course.
So all you need to do is download the Wireshark captures, and then you can follow along and follow
what I'm doing.
So you can actually try this yourself rather than trying to build a whole network, capture the packets
and then try and follow along.
You can simply download the Wireshark captures.
So I've made this a lot easier for you.
Just download the Wireshark captures and then you can try this yourself.
Now obviously if you want to try this in your networks, either at home or in the office and so forth,
but be careful.
You need to have permission to capture traffic, especially if you're going to be capturing passwords.
So don't just go and capture any traffic anywhere you could land in trouble.
So make sure that you have permission to capture the packets of a network if it's not your own private
network.
Okay.
So in the next video, I'm going to show you how to download Wireshark, how to install it on a Windows
computer.
And I'll also show you how to install it on a mac.
And then I'm going to show you how to interpret.
Wireshark captures really important skill to have.
It's important that you know how to read Wireshark captures.
So I'm introducing this now.
It's quite a complex topic.
You may struggle now.
Please don't worry if you struggle initially, all of us initially struggle with new technologies.
Keep on studying, keep on learning, do the labs.
That's probably the best advice I can give you.
Keep on trying, keep on learning, and you'll get it.
Okay, so that's enough said about Wireshark.
In the next video, I'm going to show you how to download and install Wireshark.