<s>
The	O
Reliable	B-Protocol
Data	I-Protocol
Protocol	I-Protocol
(	O
RDP	O
)	O
is	O
a	O
network	O
transport	O
protocol	O
defined	O
in	O
and	O
was	O
updated	O
in	O
.	O
</s>
<s>
The	O
Reliable	B-Protocol
Data	I-Protocol
Protocol	I-Protocol
is	O
located	O
on	O
the	O
Transport	O
Layer	O
of	O
the	O
OSI	O
model	O
next	O
to	O
protocols	O
like	O
TCP	B-Protocol
and	O
UDP	B-Protocol
.	O
</s>
<s>
It	O
is	O
number	O
27	O
in	O
the	O
list	B-Protocol
of	I-Protocol
IP	I-Protocol
protocol	I-Protocol
numbers	I-Protocol
.	O
</s>
<s>
Similar	O
to	O
TCP	B-Protocol
,	O
the	O
Reliable	B-Protocol
Data	I-Protocol
Protocol	I-Protocol
is	O
connection	O
oriented	O
,	O
but	O
,	O
contrary	O
to	O
TCP	B-Protocol
,	O
it	O
does	O
not	O
require	O
sequenced	O
delivery	O
of	O
segments	O
.	O
</s>
<s>
The	O
Reliable	B-Protocol
Data	I-Protocol
Protocol	I-Protocol
has	O
not	O
gained	O
popularity	O
,	O
though	O
experimental	O
implementations	O
for	O
BSD	O
exist	O
.	O
</s>
