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Hey guys and welcome back. So now what I want to do is to turn your attention to the concept

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of wireless networks. Now for the L-PIC 2 examination we really don't have to understand

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wireless in too great a detail and this is I suppose pretty fortunate because when you happen to have

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a virtual machine setup the ability to be able to practice wireless commands is kind of off limits.

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For example if I happen to do my ifconfig command if you actually notice here my interface is apparently

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an ethernet interface this is actually not true what I'm connecting to is to my wireless router

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in the house so I actually have a wireless connection going on here but because I'm using a

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virtual machine it's actually being presented to my operating system as an ethernet interface so

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unless you happen to be working on a real Linux device connecting to a wireless network the commands

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that I'm going to talk to you about well you're not going to be able to get any meaningful information

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from due to the nature of this virtualization. Now like I say the good news is is that we just

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have to have a basic understanding of wireless networks for the L-PIC 2 examination. The commands

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I'm going to talk to you about we don't actually have to understand in any great detail we just

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have to understand their general purpose so that is exactly what we'll just focus in on within this

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nugget. Now obviously I am assuming in 2022 which is the year in which I am recording this I am

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hoping you as an IT enthusiast have actually heard of a wireless network in fact you probably are

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using one right now but despite this let me just highlight some of the terminology we want to be

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aware of one is called an access point otherwise known as a wireless access point and we want to

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know what this concept is because it does relate to one of the commands I want to talk to you about.

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Now all a wireless accent point does it allows us to effectively connect an un-wired network to a

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wired network. The way the setup is going right now in my house I have my little laptop here

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within my laptop I have a wireless network card that allows me to make a wireless connection

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and within my house I have one of these access points and that can pick up that signal so I can

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talk to the access point and the access point has a wire which is connected to my home router so

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really I talk wirelessly to my AP my AP is wired and connected into my router and my home

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router connection has a fiber connection to my ISP so simply put I can walk around my house with my

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laptop so long as I am within range of the access points and that will allow me to join my un-wired

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connection i.e this portion of the network join that to the wired portion without me over here

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having to be plugged in now again I am pretty sure that what I'm talking about is pretty familiar

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to many of you watching so with that said how about we talk about these two commands that we

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want to be aware of the first command is the IWconfig command this is kind of like the IFconfig

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command the difference here is that this is related to wireless connections hence the W so really if

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you happen to have a wireless network interface card within your computer which I actually do

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even though my Linux machine is not displaying this as a virtual machine if you have such a card in

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and you issue the IWconfig command on your Linux machine what this is going to do is going to

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display the settings and the parameters for that particular wireless interface so since I actually

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can't issue the command what I've done is I've got an image of what this command output would look

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like we can see the interfaces on the left we can see the look back interface we can see the wireless

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LAN interface wireless LAN 0 and similar to the IFconfig we can see information relating to

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transmit statistics and received statistics we can get a link quality score the signal level

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we can see the ESSID what this is is the extended service set identification quite simply this is

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the name given to the wireless device that you're connecting to so that it can be found and differentiated

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from other potential wireless networks and just like with the IFconfig command the IWconfig command

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does not just print out information you can actually make modifications and changes to the wireless

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configuration via this command if you so choose but again the details of that is outside the scope

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of the examination now the other command I want to give a brief mention to that we want to be aware

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of is the IWList command and this command actually has a very particular setting which is of great

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use to us and this is the IWListScan command what this command will actually do it will allow you

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to scan for wireless devices within your local range so if you happen to execute this command

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you will see all the wireless devices which are answering back within your range you'll get information

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such as the ESSID which we just talked about so not just the one that you're actually connected to

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these are just ones that are out there that you could potentially connect to you'll get the MAC

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information of that access point as well as a whole bunch of other information such as the

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type of encryption that it's using and the channel information as well as the exact frequency it's

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using so really the commands we want to be remembering for the purposes of the examination

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is the IWconfig command that will allow us to display our current wireless settings as well as

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modify those settings if we so need and we also have the IWListScan command which will allow us to

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scan for and then list the wireless networks nearby that we could potentially connect to

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and could potentially use as a wireless access point and really those are the main bullet points

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that we want to be remembering for the purposes of the LPIC2 examination okay dogs so I hope this

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has been informative for you and I'd like to thank you for viewing