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Mahmoud Eladl
by Mahmoud Eladl , android developer , أطياف للحلول المتكاملة

to reduce broadcast domain and increase security

Mahmoud Mohamed Salah Eldeen
by Mahmoud Mohamed Salah Eldeen , System admins supervisor , Network International

VLAN was introduced to mitigate broadcasts on switches, as all switch ports hear any broad cast.
VLAN (Virtual LAN) works as follow : - each port on a switch can be assigned to one and only one VLAN ( all ports are assigned to VLAN 1 by default).
- when creating new VLAN and assign ports to it , these ports can only communicate with each other up to layer 2 ( datalink layer) -hosts connected to a certain VLAN are configured with IP addresses belong to certain subnet mask, so layer 3 communication is not allowed between hosts connected to different VLANs.
- to allow connectivity between devices connected to different VLAN , layer 3 device is needed ( routers or layer 3 switches) to route traffic between VLANs ( different subnets).

Mojahid Abdullrahem Hammed Mohammed
by Mojahid Abdullrahem Hammed Mohammed , Technical Support Engineer , Ratco Door Hardware

using VLANs to segment your network can be useful to control brodcast traffic and implement security boundarise.However,allowing absolutely NO access between VLANs is never beneficial.To fix this,we need to implement inter-VLAN routing..And to make this happen there are two ways: 1-Attach a unique router port to each VLAN 2-Implement router on a stick

ahmed abdel hameed
by ahmed abdel hameed , IT Team leader , Pioneers-securities

using create VLANs to reduce the network broadcasts and increasing your security.
you need first create vlans,assosaite ports to its vlan,if your network complex you need assoiate trunk ports between Switches to switches and between switches and routers.
finally used routing method to mack the traffic pass between the deiffrents VLAn you can used one from the following method:- 1-router on stock (used one router and sub-interface).
2-assoiate router for each vlan.
3-used L3 switch for inter-vlan rounting

abdur rasheed
by abdur rasheed , Network Administrator , Warid Telecom (Al-Khalej Telecom)

we make it to enhance the security and to increase the bandwidth utility

Shihab P A
by Shihab P A , IT Specialist , Greenblok

For communicating between different Vlans

Abid Sheikh (CCIE, PMP, CISA, VCP)
by Abid Sheikh (CCIE, PMP, CISA, VCP) , Senior System / Network Engineer , Data Steel Pipe Industries Pvt Ltd

There is no such thing as intervlan.
There are Vlans and there is inter vlan routing.
VLAN create segments in a broadcast domain.
there can be many reasons to segment the network but most obvious are to provide security and to limit the broadcast.
Intervlan routing are basincally used to enable communciation between different VLANS.
This is just a very brief answers for why.
You can find alot of detailed literature on HOW and WHAT.
   

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