VLAN
16
Mar

VLAN Uses On Automation

VLANs are a way to divide the switch into different LAN segments. As we discussed earlier, networks connected to a switch are usually a one broadcast domain, this means that all devices that are connected to a switch use 1 IP sub-net by default.

if devices into the switch ports, switch creates separate collision domain for each port and single broadcast domain for all ports. In a large network having hundreds of computers. Devices are same VLAN ID are the members of same broadcast domain and receive all broadcasts. 

VLAN provides following advantages: –

• Solve broadcast problem

• Reduce the size of broadcast domains

• Allow us to add additional layer of security

• Make device management easier

• Allow us to implement the logical grouping of devices by function instead of location

In short, there are 2 types of VLANs:

1. Port-based VLANs (untagged)

2. Tagged VLANs

The use of VLANs is very important in today’s networks. To appreciate VLANs, we need to consider why they are important.

Security –   a single physical device can be used for users with a set of distinguished access rights, the traffic in a sensitive group can use the same switch as a group with common traffic without breaching the security policies.

Reduction of costs – by using VLANs, the needed costs can be reduced if each department in an organization needed a physical switch. With a 24-port switch, and 20 users in separate departments, VLAN’s can be implemented to separate them without the need of a additional hardware.

Performance improvement – as we have mentioned earlier, the default operation of a switch is in one broadcast domain because of which the performance of the network might degrade. Whereas by using the VLAN’s, the broadcast traffic is limited to a particular VLAN.

Administrative tasks improvement – Using VLAN’s relieves the work of IT Administrators performing to maintain the network. With VLANs, network upgradation, troubleshooting and other tasks are made easier.