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In chart
1，on a two layer switch which not set VLAN，any radio frame is forwarded to all the other ports in
addition to receiving port. e.g，PC A（port 1）After sending the broadcast information，will be
forwarded to the port 2、3、4.
In chart 2，the switch generate red and blue VLAN；Meanwhile set port 1、2 as red VLAN、port 3、
4 are VLAN. Then A（port 1）send out broadcast frame，switches only will forward it to other port
belongs to a VLAN——port 2 which also belong to red VLAN，Will not be forwarded to the blue port
VLAN. As well，C（port 3）send out broadcast frame，Will only be forwarded to other belong to the
blue port VLAN，Will not be forwarded to belong to the red VLAN ports.
In this way，VLAN by limiting the broadcast frame forwarding range to partition the broadcast
domain. In the above chart for better illustration，use red, blue two colors to identify different VLAN，
in the practice is using “VLAN ID" to distinguish.
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