<s>
A	O
VLAN	B-General_Concept
access	I-General_Concept
control	I-General_Concept
list	I-General_Concept
(	O
VACL	B-General_Concept
)	O
provides	O
access	O
control	O
for	O
all	O
packets	O
that	O
are	O
bridged	O
within	O
a	O
VLAN	B-General_Concept
or	O
that	O
are	O
routed	O
into	O
or	O
out	O
of	O
a	O
VLAN	B-General_Concept
.	O
</s>
<s>
Unlike	O
regular	O
Cisco	B-Protocol
IOS	I-Protocol
access	O
control	O
lists	O
that	O
are	O
configured	O
on	O
router	O
interfaces	O
and	O
applied	O
on	O
routed	O
packets	O
only	O
,	O
VACLs	B-General_Concept
apply	O
to	O
all	O
packets	O
.	O
</s>
<s>
VACLs	B-General_Concept
may	O
be	O
used	O
in	O
similar	O
fashion	O
to	O
a	O
SPAN	B-Protocol
port	I-Protocol
or	O
network	B-Device
tap	I-Device
,	O
as	O
a	O
way	O
to	O
replicate	O
computer	O
network	O
data	O
that	O
is	O
coming	O
into	O
and	O
leaving	O
from	O
a	O
computer	O
or	O
a	O
network	O
.	O
</s>
<s>
Often	O
,	O
this	O
configuration	O
is	O
used	O
to	O
facilitate	O
data	B-Application
loss	I-Application
prevention	I-Application
(	O
DLP	O
)	O
or	O
network-based	O
Intrusion	O
prevention	O
systems	O
.	O
</s>
<s>
VACL	B-General_Concept
or	O
VACL	B-General_Concept
Ports	O
can	O
be	O
much	O
more	O
discriminating	O
of	O
the	O
traffic	O
they	O
forward	O
compared	O
to	O
a	O
standard	O
SPAN	B-Protocol
port	I-Protocol
.	O
</s>
<s>
They	O
may	O
be	O
set	O
to	O
only	O
forward	O
specific	O
types	O
or	O
specific	O
VLANs	B-General_Concept
to	O
the	O
monitoring	O
port	O
.	O
</s>
<s>
However	O
,	O
they	O
forward	O
all	O
traffic	O
that	O
matches	O
the	O
criteria	O
,	O
as	O
they	O
do	O
not	O
have	O
the	O
functionality	O
to	O
select	O
from	O
ingress	O
or	O
egress	B-Protocol
traffic	O
like	O
SPAN	B-Protocol
ports	I-Protocol
.	O
</s>
