All language subtitles for Free-CCNA-Wireshark-Demo-TCPUDP-Day-30-Lab-CCNA-200-301-Complete-Course_en

This is a free, complete course for the CCNA.

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In this video we’ll take a look at Wireshark.

I have shown you Wireshark a couple times\n

Although there is a lot you can learn about\n

Network engineers use it as a tool in their\n

Using Packet Tracer’s ‘simulation’ mode\n

not at the same level as Wireshark.

Packet Tracer is a network simulator, but\n

Up here you can see the packets as they are\n

you are capturing traffic from, and if you\n

Note that this kind of software is called\n

Packet is just a general term we use, it doesn’t\n

As you can see here, the entire frame is indeed\ncaptured.

To download Wireshark, go to wireshark.org.

It’s totally free, so you really should\nget it.

At the end of this demonstration I’ll give\n

so you’ll need to download it if you want\nto do them.

Usually in my lab videos I give a shoutout\n

simulator with a ton of guided practice labs.

Since I’m not doing a regular configuration\n

Boson’s CCNA courseware, which they released\nrecently.

Basically, this is Boson’s complete course\nfor the CCNA.

What do you get in the courseware?

You get the curriculum, which is the main\n

You get a PDF lab guide, and on top of that\n

These are not the labs included in NetSim\n

Here’s the table of contents for the curriculum,\n

I always recommend using multiple resources\n

I didn’t use their courseware for the previous\n

courseware to study for my exams and it was\nexcellent.

If you want to get Boson’s courseware, follow\n

You can download a sample from their website.

First up I’m just going to show you a brief\n

being sent and received by the network interface\nof my PC.

When the capture starts you’ll see there’s\n

Then I open a YouTube page and start watching\n

Okay, let’s just watch the video, it’s\n

through an actual analysis of some of the\ntraffic.

Okay, so that was a lot of traffic that went\npassing by.

Notice that in Wireshark you are able to filter\noutput.

There are many ways you can do so.

This video isn’t about how to master Wireshark,\n

Just notice that I filtered by the TCP port\nnumber.

If you do want to learn more about Wireshark,\n

and also a free Wireshark and ethical hacking\n

Okay, notice the first message here, under\n

Under ‘info’ you can see the source and\ndestination ports.

From 62652 to 443 in the first message, and\n

It’s the random source port my PC selected\n

That’s HTTPS, Hypertext Transfer Protocol\n

Look here, do you recognize this series of\nmessages?

So, in these first three messages my PC and\n

You can also see the sequence number, acknowledgment number, and

Remember that I said the initial sequence\n

You might be thinking it’s a big coincidence\n

In Wireshark it is displayed as 0 here to\n

but that’s not the actual sequence number.

When we look further at the details of the\n

So, sequence number 0 is acknowledged with\n

Then my PC sends sequence number 1.

Once again, these aren’t the real sequence\n

this to make it easier to look at and analyze\nthe data exchange.

Then there is the actual exchange of data\nhere.

Notice that most of these display SSL in the\nprotocol column.

SSL is what gives the security to HTTPS, Hypertext\n

TCP is still being used, but Wireshark displays\n

Finally, you can see the exchange of FINs\n

You probably noticed that the flags are a\n

lecture, there is an extra ACK in the first\nand third messages.

There are some nuances to the connection termination\n

I recommend just remembering the basic FIN,\n

Now let’s briefly look inside one of those\nsegments.

This is the very first SYN message at the\n

First up, notice that the segment is of course\n

We’re just looking deeper than we did before,\n

Okay, I want to point out the sequence number\nhere.

Notice that ‘0’ is the relative sequence\nnumber.

Wireshark does this to make it easier to analyze\nthe traffic.

Below you can see the real sequence number.

As you can probably imagine, it is much harder\n

numbers like 1 billion 224 million 315 thousand\n781.

Okay, there are just a couple other things\n

Because this is a SYN message, under the ‘flags’\n

All of the other flags are not set, they are\n0.

Finally, you can see the TCP window size down\nhere.

Okay, before wrapping up this brief demonstration\n

First up, notice that this is a DNS, Domain\n

This is from my PC to a DNS server.

So, what will the destination port be?

As you can see here, my PC selected a random\n

used 53 as the destination port, because that’s\n

Within the segment you can indeed see that\n

This is a DNS query message, you’ll learn\n

That’s all I wanted to point out about UDP,\n

Finally, here’s a little bit of homework\n

You don’t have to do this, of course, but\n

First, download Wireshark from wireshark.org.

Then use it to capture network traffic sent\n

Visit some websites while Wireshark is running.

Then stop the Wireshark capture.

Check out the packet captures, and find a\n

Then find a TCP four-way handshake, a TCP\n

Again, if you really want to learn how to\n

Bombal’s free videos on YouTube or getting\n

I’m no Wireshark expert myself, David Bombal\n

Okay, that’s all for the video, I hope it\n

captures and see some of the things we studied\n

Before finishing today’s video I want to\n

To join, please click the ‘Join’ button\nunder the video.

Thank you to Benjamin, Deepak, Tshepiso, Justin,\n

Erlison, Apogee, Wasseem, Marko, Florian,\n

Value, John, Funnydart, Scott, Hassan, Gerrard,\n

Mark, Yousif, Sidi, Boson Software, Charlesetta,\n

Sorry if I pronounced your name incorrectly,\n

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