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It is the concept of VLAN that most of the books are using but it doesn’t help us understand the benefits of VLANs. It means that the devices in the same VLAN may be widely separated in the network, both by geography and location. To solve the first problem maybe you will create a new and more powerful network for your leaders. If these departments expand in the future you can still use the same network in any other floor.
Although layer 2 switches can only break up collision domains but VLANs can be used to break up broadcast domains.
When using VLANs in networks that have multiple interconnected switches, you need to use VLAN trunking between the switches. Notice that the tag is only added and removed by the switches when frames are sent out on the trunk links. Note: Trunk link does not belong to a specific VLAN, rather it is a conduit for VLANs between switches and routers.
To allow interVLAN routing you need to configure trunking on the link between router and switch. Cisco switches support two different trunking protocols, Inter-Switch Link (ISL) and IEEE 802.1q.


In 802.1q encapsulation, there is a concept called native VLAN that was created for backward compatibility with old devices that don’t support VLANs.
VLANs logically segment the network into different broadcast domains so that packets are only switched between ports that are designated for the same VLAN.
Suppose you are working in a big company with many departments, some of them are SALES and TECHNICAL departments. They want to access to SALES resources but they can only access to the TECH resources because they are connecting to TECH switch. But notice that each leader sits at different floor so you will need to link all of them to a switch -> what a mess! Maybe you have to create another network at the TECH area and apply the same policy as the SALES department for these hosts -> another mess in management! VLAN helps you group users together according to their function rather than their physical location.
For example, SALES needs to have 40 more employees -> you can use 4th floor for this expansion without changing the current network.
Hosts in the same VLAN can communicate normally even they are connecting to 2 or more different switches. With VLAN trunking, the switches tag each frame sent between switches so that the receiving switch knows which VLAN the frame belongs to.


Hosts don’t know about this tag because it is added on the first switch and removed on the last switch. If a switch receives untagged frames on a trunkport, they are assumed to be part of the native vlan.
You are tasked to separate these departments so that each of them can only access specific resources in the company. This means you can use the same network for hosts in different floors (of course they can communicate with each other).
If one computer sends a broadcast packet will it be flooded to other departments as switch doesn’t break up broadcast domains? Without a router, the computers within each VLAN can communicate with each other but not with any other computers in another VLAN. By default, VLAN 1 is the default and native VLAN but this can be changed on a per port basis by configuration.



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