<s>
In-band	B-General_Concept
control	I-General_Concept
is	O
a	O
characteristic	O
of	O
network	O
protocols	O
with	O
which	O
data	O
control	O
is	O
regulated	O
.	O
</s>
<s>
In-band	B-General_Concept
control	I-General_Concept
passes	O
control	O
data	O
on	O
the	O
same	O
connection	O
as	O
main	O
data	O
.	O
</s>
<s>
Protocols	O
that	O
use	O
in-band	B-General_Concept
control	I-General_Concept
include	O
HTTP	B-Protocol
and	O
SMTP	B-Protocol
.	O
</s>
<s>
This	O
is	O
as	O
opposed	O
to	O
Out-of-band	B-General_Concept
control	I-General_Concept
used	O
by	O
protocols	O
such	O
as	O
FTP	B-Protocol
.	O
</s>
<s>
Here	O
is	O
an	O
example	O
of	O
an	O
SMTP	B-Protocol
client-server	B-Operating_System
interaction	O
:	O
</s>
<s>
SMTP	B-Protocol
is	O
in-band	O
because	O
the	O
control	O
messages	O
,	O
such	O
as	O
"	O
HELO	O
"	O
and	O
"	O
MAIL	O
FROM	O
"	O
,	O
are	O
sent	O
in	O
the	O
same	O
stream	O
as	O
the	O
actual	O
message	O
content	O
.	O
</s>
