<s>
ntop	B-Protocol
is	O
computer	O
software	O
that	O
probes	O
a	O
computer	B-Architecture
network	I-Architecture
to	O
show	O
network	O
use	O
in	O
a	O
way	O
similar	O
to	O
what	O
the	O
program	O
top	B-Device
does	O
for	O
processes	B-Operating_System
.	O
</s>
<s>
In	O
Web	O
mode	O
,	O
it	O
acts	O
as	O
a	O
web	B-Application
server	I-Application
,	O
creating	O
a	O
HTML	B-Language
dump	O
of	O
the	O
network	O
status	O
.	O
</s>
<s>
It	O
supports	O
a	O
NetFlow-sFlow	O
emitter-collector	O
,	O
a	O
Hypertext	B-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
HTTP	B-Protocol
)	O
based	O
client	O
interface	O
for	O
creating	O
ntop-centric	O
monitoring	O
applications	O
,	O
and	O
RRDtool	B-Language
(	O
RRD	O
)	O
for	O
persistently	O
storing	O
traffic	O
statistics	O
.	O
</s>
<s>
ntop	B-Protocol
is	O
available	O
for	O
both	O
Unix	B-Application
and	O
Win32-based	O
platforms	O
.	O
</s>
<s>
Common	O
usage	O
on	O
a	O
Linux	B-Application
system	O
is	O
to	O
start	O
the	O
ntop	B-Protocol
daemon	B-Operating_System
(	O
)	O
,	O
then	O
one	O
can	O
use	O
the	O
web	O
interface	O
to	O
ntop	B-Protocol
via	O
visiting	O
provided	O
the	O
loopback	O
device	O
has	O
been	O
started	O
(	O
)	O
and	O
the	O
listening	O
port	O
for	O
ntop	B-Protocol
is	O
3000	O
(	O
look	O
out	O
for	O
the	O
option	O
in	O
)	O
.	O
</s>
