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Why we need different types of VLANs like Port based,Protocol based ... Give me situations where exactly those types are useful

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As of today, all five of your questions are about to VLANs. Homework questions are not necessarily discouraged here, but perhaps you should be asking, instead, which technical references would most benefit your studies. –  jscott Sep 18 '10 at 12:51
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closed as not a real question by ThatGraemeGuy, Oskar Duveborn, Alnitak, EEAA, Mark Henderson Sep 20 '10 at 1:06

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1 Answer

This is not different types of Vlan, this is different way to affect the vlan to packet.
Most common one is port based, it's easier way as you statically assign a Vlan to all packet coming in a particular port.
In some situation you can't do port based vlan, like in Wireless networks where user are not connected to a physical port. In this case, for Wi-Fi, most of the time vlan will be assigned base on the SSID of the Wi-Fi network. Another commun vlan assignment method is by mac-address.

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