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In this course, we are mainly using Cisco Packet Tracer to simulate networks.

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Cisco Packet Tracer is fantastic software.

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It allows us to simulate all kinds of networks.

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We can simulate routers, we can simulate switches, we can simulate wireless access points, wireless

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LAN controllers, all kinds of devices can be simulated using Cisco packet tracer, but it's a simulator.

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It doesn't actually show us what's happening in a real network.

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It gets us a long way there.

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Fantastic software for building virtual networks on your laptop.

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But if you really want to see what's actually happening on a network, you need to use something like

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Wireshark.

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So in this course, I'm going to show you why Shock Captures and we're going to dig deep into the packets.

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We're going to look at applications such as HTTP, FTP and others.

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I'm going to show you how you can capture passwords off the wire or off the air if you're using a wireless

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network.

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So basically, Wireshark is what's called a protocol analyzer.

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It captures traffic off the wire and allows you to view packets that have been sent by either your device

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or other devices.

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If you use a mode called promiscuous mode, basically, Wireshark is a fantastic tool that network engineers

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use to analyze networks and find out if they're problems on a network.

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In this example, it's going to be voice over IP traffic.

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In other words, we're going to capture traffic between virtual phones as shown here, as well as virtual

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phones and physical phones.

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I'm going to make calls between these two phones and then we're going to capture the traffic and then

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replay the voice call.

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And we're going to use Wireshark for that.

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This is my second call.

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David Bumble speaking to himself, click play streams.

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And there's our voice call.

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This is my second call.

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David Bono's speaking to himself.

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Himself now to make it easier for you rather than you trying to build some of the networks that I've

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created in this course.

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I've captured the packets in Wireshark and I've attached them to the course.

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So all you need to do is download the Wireshark captures, and then you can follow along and follow

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what I'm doing.

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So you can actually try this yourself rather than trying to build a whole network, capture the packets

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and then try and follow along.

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You can simply download the Wireshark captures.

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So I've made this a lot easier for you.

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Just download the Wireshark captures and then you can try this yourself.

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Now obviously if you want to try this in your networks, either at home or in the office and so forth,

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but be careful.

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You need to have permission to capture traffic, especially if you're going to be capturing passwords.

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So don't just go and capture any traffic anywhere you could land in trouble.

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So make sure that you have permission to capture the packets of a network if it's not your own private

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network.

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Okay.

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So in the next video, I'm going to show you how to download Wireshark, how to install it on a Windows

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computer.

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And I'll also show you how to install it on a mac.

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And then I'm going to show you how to interpret.

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Wireshark captures really important skill to have.

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It's important that you know how to read Wireshark captures.

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So I'm introducing this now.

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It's quite a complex topic.

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You may struggle now.

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Please don't worry if you struggle initially, all of us initially struggle with new technologies.

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Keep on studying, keep on learning, do the labs.

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That's probably the best advice I can give you.

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Keep on trying, keep on learning, and you'll get it.

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Okay, so that's enough said about Wireshark.

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In the next video, I'm going to show you how to download and install Wireshark.