<s>
Computer	B-Operating_System
network	I-Operating_System
programming	I-Operating_System
involves	O
writing	O
computer	B-Application
programs	I-Application
that	O
enable	O
processes	B-Operating_System
to	O
communicate	O
with	O
each	O
other	O
across	O
a	O
computer	B-Architecture
network	I-Architecture
.	O
</s>
<s>
Examples	O
of	O
the	O
connection-oriented	O
protocols	O
include	O
and	O
,	O
and	O
examples	O
of	O
connectionless	O
protocols	O
include	O
,	O
"	O
raw	O
IP	B-Protocol
"	O
,	O
and	O
.	O
</s>
<s>
Network	B-Operating_System
programming	I-Operating_System
traditionally	O
covers	O
different	O
layers	O
of	O
OSI/ISO	O
model	O
(	O
most	O
of	O
application-level	O
programming	O
belongs	O
to	O
L4	O
and	O
up	O
)	O
.	O
</s>
<s>
The	O
table	O
below	O
contains	O
some	O
examples	O
of	O
popular	O
protocols	O
belonging	O
to	O
different	O
OSI/ISO	O
layers	O
,	O
and	O
popular	O
APIs	B-Application
for	O
them	O
.	O
</s>
