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Let's recall the most significant benefits of the use of the Inter-VLAN Routing technique:
- It is easier to manage the networks' infrastructures;
- Excellent scalability;
- Possibility of extending beyond the physical limits of the single switch;
- Cheapness;
- Decrease network traffic.

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8- Here an attached example of the Router on a stick with Cisco Packet Tracer

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8- Here an attached example of the Router on a stick with Cisco Packet Tracer

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Configuration of the router and the switch:
Router's configuration:
Router#config t
Router(config)#interface fastEthernet 0/0.2
Router(config-subif)#
Subinterfaces' configuration:
Router(config-subif)#encapsulation dot1Q 2

Router(config-subif)#ip address 192.168.2.1 255.255.255.0

Router(config-subif)#no shut
Just like a real interface these interfaces must have an IP address.
Switch's configuration:
Switch>en
Switch#config t
Switch(config)#interface fastEthernet 0/1
Switch(config-if)#switchport mode trunk

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Here there is an example of the Router on a stick.

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The main equipment as the title reveals is the router. In this particularly case the router is connected to one of the switch of the LAN with a single physical interface. So the physical interface is split in many virtual interfaces as the number of the VLANs. Each virtual interface of the router is associated to a VLAN and so it needs an IP address related to the VLAN.

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VLANs can extend over physical limit of the single switch through the VLAN TAGGING:
VLAN involves routers which have to be configured. To allow the communication between different VLANs it is necessary to introduce within the LAN a router or a switch layer 3. That's because we talk about Inter-VLAN Routing.
There are three different solutions for the Inter-VLAN. We will now discuss about Router on a stick solution.

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Security:
- Networks can be completely separated from each other (there's no communication);
Network's traffic:
- Broadcast traffic can be limited between the networks (In computer networking, broadcast traffic is a type of data sent to all computers and devices on a network or subnetwork).

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Here an example of a VLAN created with the software CISCO PACKET TRACER.

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A VIRTUAL LAN, known as VLAN, is a LAN made logically thanks to the standard 802.1Q. This standard defines different logical networks using the same physical infrastructure.