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And now is the moment you've all been waiting for.

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It's time to build our network in three.

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So I'm in my host machine and you don't see the three.

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It's closed at the moment.

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So I'll go to the applications menu and click the three icon to run it.

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So let's create a new project, or you can use the project that we created before.

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Expand routers from the device's toolbar.

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As you see installed items is selected from the combo box above.

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The only router available is C 3725.

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That's what I imported a few lectures before.

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So I'll drag it and drop it into the workspace from the switches menu.

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Drag an ether switch router that we created before and drop it into the workspace.

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Now go to the end devices and drag and drop a vpcs.

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Here Vpcs are the end user computer simulations of three.

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They're very lightweight and have a very restricted ability, but it'll be enough to test the network

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configurations.

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And now I'll just add a second.

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Vpcs.

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Okay.

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Now we have a router, an ether switch and two PCs in our network.

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They all have their default names on top given by the Gns3 app.

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So now I want to design the network and label the devices accordingly.

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Click the labels icon on the toolbar and put a label under the PC one.

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This PC will be in IP block of 192.168.10.0 slash 24.

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Let's say it's the Vlan ten.

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Now to create a new label, you can right click on an existing one and select duplicate.

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Right click the label again and select text edit to edit the text.

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So let's put the second PC into Vlan 20, which is in the IP block of 192.168.20.0 24.

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Now click on the last icon on the Devices toolbar to connect the devices.

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Click the router, select the port you want to connect, and then select the switch and select the port

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of the switch again.

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I connect the fast Ethernet zero zero port of the router with the fast Ethernet one one of the switch.

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Good.

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So now connect the PC one with the switch.

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Click Switch select Fast Ethernet one two and click PC one.

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And it already has a single network interface.

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Ethernet zero.

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Now do the same with the second PC and use a port of the switch.

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For example.

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Fast Ethernet 110.

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We connected all the nodes on the workspace.

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So now we can click the connect icon to disable the connect mode.

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Then in the toolbar we have a button named show hide interface labels.

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If you click it when the labels are hidden, you'll see the labels of each interface connected.

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F stands for fast Ethernet and E stands for the Ethernet.

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And you can move the labels as you wish.

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Now let's start the notes.

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We can start them one by one, by right clicking on them and selecting start from the menu or from the

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toolbar.

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Click the green triangle to start all the nodes at once.

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Now all the nodes are running.

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So now is the time to create our network topology.

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I'll create two VLANs and add the PCs to their VLANs.

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First, we'll create the virtual LANs.

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Right click on the switch and click console.

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Good.

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Welcome to the command line interface of a Cisco ether switch.

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Look familiar?

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So press enter to get started.

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Type Vlan database and go there.

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You can use the tab key to complete the keywords in this console.

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So instead you can use the short form of the keywords directly.

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If the keyword is the only available option for that short form.

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So for example, I wrote Vlan space d a and hit the tab key.

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The key word is completed.

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Database.

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So that means that database is the only option here for De.

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And as a result if I type villain space DA and hit enter here I'd be in the villain database mode.

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Right.

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So here we are in Vlan database mode to create Vlan ten type vlan id number ten, name it for example

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it, HR or whatever you want, I'll name it Vlan ten and leave it at that hit enter and Vlan ten is

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created.

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So similarly, let's create Vlan 20 with the id number 20.

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Type exit to exit the Vlan database mode.

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Now, as you exit, the changes are applied.

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So that was pretty cool.

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Okay, so let's go into the Vlan database mode again to check whether the VLANs were actually created.

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So type show current.

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And here are the villains we created a couple of seconds ago.

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Vlan ten with the ID number of ten and here's Vlan 20 with the id number of 20.

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So type exit again and we're on the route of the switch console.

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So now is it time to configure interfaces and add the PCs to their VLANs?

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The first command we type is configure terminal.

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And as mentioned before, you can simply type conf T to enter configuration mode.

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Now we need to select the interface to configure.

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Type int space F and hit tab.

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F will be completed as fast Ethernet.

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You see how that works.

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So now we can write the identifier of the switch port 1/2.

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Alternatively, you can directly type F1/2 as seen in the gns3 workspace.

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Now we are in the config mode of the interface F12, which just happens to be the port we connected

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to the PC one.

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Now to identify the mode of the port.

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Type switch port mode access first.

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Then to assign the port to the Vlan ten type switch port access Vlan ten.

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Where ten is the ID number of Vlan ten.

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No.

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To shut down and exit.

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We exit from the port's config mode, but we are still in the terminal configuration mode.

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So while we're here, let's configure the other port which is connected to PC to interface fast Ethernet

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one slash ten.

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Switchport mode access.

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Okay.

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Well, right here, I want to show you a well, a tip.

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You can use a question mark in any one of the commands.

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If you put a question mark after the mode, it says you can either use access or trunk here.

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An access port can only have one Vlan configured on the interface.

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It can carry traffic for only one Vlan.

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Right.

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A trunk port can have two or more vlans configured on the interface that can carry traffic for several

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Vlan simultaneously.

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So Switchport access Vlan 20 goes right here.

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No.

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Shut down and exit.

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Great.

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So we've configured the interfaces connected to the PC.

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So now let's configure the port connected to the router.

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INT for interface F1/1 to enter the config mode of that interface.

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Switchport mode is trunk.

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Wait a second.

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And yes, the port has become a dot one trunk dot one queue is a well known name of the 802.1 queue,

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which is the networking standard that supports virtual LANs or VLANs on an I triple E 802.3 Ethernet

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network.

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Now type Switchport Trunk encapsulation dot one queue.

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No to shut down and exit.

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Type exit again to exit the config mode completely.

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Then type SR to make the configurations persistent.

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Excellent.

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Now let's configure the router.

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Right click on the router and select console.

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The ports are being initialized now.

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Okay.

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Entering into the config mode is the same type config terminal or simply conf t and hit enter.

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So the only interface of our router is fast ethernet zero zero.

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So type interface F0/0.

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No IP address.

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No.

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Shut down.

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And look at that.

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The port is up right now.

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So hit exit and we'll exit from the interface for now.

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So now we're ready to configure the subinterfaces and the settings of the VLANs are decided here.

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To enter the Subinterface configuration type interface fast Ethernet 0/0.1 where dot one identifies

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the sub interface.

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Right Type encapsulation dot one Q and a question mark to see the options.

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Look at that here.

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Vlan ID is one of the options.

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So type encapsulation dot one q ten.

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Now type IP address.

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192.168.10.1255.255.255.0

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and press enter.

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192.168.10.1 Is the IP address of the router for this Vlan and 255.255.255.0 is a subnet mask of the

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network, so the IP block of the Vlan ten will be 192.168.10.0 slash 24.

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No.

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To shut down and exit.

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And here we are back in the configure terminal mode.

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So now we'll apply the same sub config for Vlan 20 type interface f0 slash 0.2.

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This time.

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Encapsulation one cue and the Vlan ID 20.

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So let's use the 192.168.20.0 slash 24 ip block for this Vlan.

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So type IP address.

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192.168.20.1255.255.255.0.

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And no shut down and exit.

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Now exit again to exit the configure terminal mode as well and type R to make the configurations persistent.

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See what I mean?

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It's a it's quite a process, but I'm glad you're hanging in there because we haven't even gotten to

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the fun stuff yet.

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Now's the time to configure the network interfaces of the PCs.

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So right click on the PC and select console.

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If you place a question mark and press enter, you'll see all the available commands in VPC console.

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So as I mentioned before, this is an end user computer simulation of gns3.

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But not to worry, it's enough to test the configurations of the networks that we created earlier.

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And as you can see here, IP command is used to configure the IP settings of the VPC.

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And here you can show or use the shortcut s h, and that's going to print the information about the

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VPC.

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So type show IP to see the current IP settings.

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And as you can see here, VPC has no IP address at the moment.

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So type IP and a question mark.

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You'll see the options of the IP command.

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And as you can see here, you'll be able to assign an IP address using this command.

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And an example is given right there to help as well.

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So let's assign an IP address for the VPC.

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IP 192.168.10.2 slash 24 To identify the subnet mask and the gateway is 192.168.10.1.

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Perfect.

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It's our router.

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So when you press enter it checks to see if there's any duplication and if everything's okay.

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It shows a summary just like this one.

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Assigned IP Address, Subnet Mask and Gateway.

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So now we can ping the router to check the configuration.

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Perfect.

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See, this is where we get all the answers.

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Now let's configure the other VPC because that one is working perfectly just the way we wanted it to.

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The steps are exactly the same.

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Right click and open the console.

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Type.

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IP 192.168.20.2 slash 24.

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192.168.20.1 and hit enter.

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Ping the router to check the config.

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And here are the answers, all the answers you've ever been looking for.

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Right.

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So go to PC one and ping PC two.

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You should be able to see the reply packets just like these ones.

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And now ping PC one from PC two.

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And everything looks perfect on my side.

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What about you?

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Right as rain.

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Right.

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Excellent.

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So let's move on.