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Why is VLAN trunking a security risk?

Answer Posted / ameen farook

while physical separation between network segments,VLAN
rely on switching should be perfect, if not
so,misconfiguration or a bug could cause the VLAN barriers
to be broken
There i a 2 risk

1.packet leaks from one VLAN to another, possibly revealing
sensitive information

2.In the second, a specially crafted packet is injected
into another VLAN. Any attack that could cause the VLAN
barriers to break requires a machine directly attached to
the physical network. This means that only a local machine
can execute an attack against the switch.

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