<s>
In	O
computer	B-Architecture
networking	I-Architecture
,	O
the	O
Link	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
LCP	O
)	O
forms	O
part	O
of	O
the	O
Point-to-Point	B-Protocol
Protocol	I-Protocol
(	O
PPP	O
)	O
,	O
within	O
the	O
family	O
of	O
Internet	B-Protocol
protocols	I-Protocol
.	O
</s>
<s>
In	O
setting	O
up	O
PPP	O
communications	O
,	O
both	O
the	O
sending	O
and	O
receiving	O
devices	O
send	O
out	O
LCP	O
packets	B-Protocol
to	O
determine	O
the	O
standards	O
of	O
the	O
ensuing	O
data	O
transmission	O
.	O
</s>
<s>
Devices	O
cannot	O
use	O
PPP	O
to	O
transmit	O
data	O
over	O
a	O
network	O
until	O
the	O
LCP	O
packet	B-Protocol
determines	O
the	O
acceptability	O
of	O
the	O
link	O
,	O
but	O
LCP	O
packets	B-Protocol
are	O
embedded	O
into	O
PPP	O
packets	B-Protocol
and	O
therefore	O
a	O
basic	O
PPP	B-Protocol
connection	I-Protocol
has	O
to	O
be	O
established	O
before	O
LCP	O
can	O
reconfigure	O
it	O
.	O
</s>
<s>
LCP	O
over	O
PPP	O
packets	B-Protocol
have	O
control	O
code	O
0xC021	O
and	O
their	O
info	O
field	O
contains	O
the	O
LCP	O
packet	B-Protocol
,	O
which	O
has	O
four	O
fields	O
(	O
Code	O
,	O
ID	O
,	O
Length	O
and	O
Data	O
)	O
.	O
</s>
