Virtual LAN - [ VLAN ]

The VLAN is mehod was used for Prevent Congestion & Broadcast within network.

Introduction
VLAN is divided Segment or (Logical Design) of the Switch [Working at layer 1 or 2 , 3] && Ignore the physical connection.


                                           image source : thebryantadvantage.com/Network+ExamTutorialVLANsIllustratedAndExplained.htm


Advantages
-Anti Broadcast Traffic.
(You can use MRTG || PRTG for monitoring broadcast traffic.)
-Configure or divided [3 vlan] , but using 1 device.
-If you need to change VLAN or subnet  etc
,You can make is easy from by configure leyer3 device.


Collision Domain - is Type&Group of Collision.
------------------
|   packet(layer3).|  ----> Router  1 port = 1 collision domain.  && 10 port = 10 collision domain.
------------------
|   frame(layer2)   |  ---- > Switch 1 port = 1 collision domain.  && 10 port = 10 collision domain.
------------------
|   signal(layer1)   |   ---- > Hub all port using = 1 collision domain.
------------------


Broadcast Domain - is type&group of Broadcase.  [1broadcast domain = 1 network].

-----------------------
|   Router(layer3)       .|  ----> 1 port connected device is 1 broadcast domain.
-----------------------
|   switch (Using Vlan).|  ----> 1 vlan = 1 Broadcast domain.  && 10 vlan = 10 Broadcast domain.
-----------------------
|   switch(layer2)         |  ---- > Switch all port = 1 broadcast domain.
-----------------------
|   hub(layer1)             |   ---- >  Hub all port = 1 broadcast domain.
-----------------------


Trunk port  - Is line for connecting network devices.
================================================================
    {pc1}------[switch] ----trunk--- [router] ---trunk---- [switch] ------ {pc2}
                         |                                                                                         |
                         |                                                                                         |
                     {pc2}                                                                               {pc1}

                 V L A N 1                                                            V L A N 2
=================================================================