<s>
Internet	B-Application
transit	I-Application
is	O
the	O
service	O
of	O
allowing	O
network	O
traffic	O
to	O
cross	O
or	O
"	O
transit	B-Application
"	O
a	O
computer	O
network	O
,	O
usually	O
used	O
to	O
connect	O
a	O
smaller	O
Internet	O
service	O
provider	O
(	O
ISP	O
)	O
to	O
the	O
larger	O
Internet	O
.	O
</s>
<s>
The	O
advertisement	O
of	O
other	O
ISPs	O
 '	O
routes	B-Protocol
(	O
usually	O
but	O
not	O
necessarily	O
in	O
the	O
form	O
of	O
a	O
default	B-Protocol
route	I-Protocol
or	O
a	O
full	O
set	O
of	O
routes	B-Protocol
to	O
all	O
of	O
the	O
destinations	O
on	O
the	O
Internet	O
)	O
to	O
the	O
ISP	O
's	O
customer	O
,	O
thereby	O
soliciting	O
outbound	O
traffic	O
from	O
the	O
customer	O
towards	O
these	O
networks	O
.	O
</s>
<s>
In	O
the	O
1970s	O
and	O
early	O
1980s-era	O
Internet	O
,	O
the	O
assumption	O
was	O
made	O
that	O
all	O
networks	O
would	O
provide	O
full	O
transit	B-Application
for	O
one	O
another	O
.	O
</s>
<s>
In	O
the	O
modern	O
private-sector	O
Internet	O
,	O
two	O
forms	O
of	O
interconnect	O
agreements	O
exist	O
between	O
Internet	O
networks	O
:	O
transit	B-Application
,	O
and	O
peering	B-Protocol
.	O
</s>
<s>
Transit	B-Application
is	O
distinct	O
from	O
peering	B-Protocol
,	O
in	O
which	O
only	O
traffic	O
between	O
the	O
two	O
ISPs	O
and	O
their	O
downstream	O
customers	O
is	O
exchanged	O
and	O
neither	O
ISP	O
can	O
see	O
upstream	O
routes	B-Protocol
over	O
the	O
peering	B-Protocol
connection	O
.	O
</s>
<s>
A	O
transit	B-Application
free	O
network	O
uses	O
only	O
peering	B-Protocol
;	O
a	O
network	O
that	O
uses	O
only	O
unpaid	O
peering	B-Protocol
and	O
connects	O
to	O
the	O
whole	O
Internet	O
is	O
considered	O
a	O
Tier	B-Architecture
1	I-Architecture
network	I-Architecture
.	O
</s>
<s>
In	O
the	O
1990s	O
,	O
the	O
network	O
access	O
point	O
concept	O
provided	O
one	O
form	O
of	O
transit	B-Application
.	O
</s>
<s>
Pricing	O
for	O
the	O
internet	B-Application
transit	I-Application
varies	O
at	O
different	O
times	O
and	O
geographical	O
locations	O
.	O
</s>
<s>
The	O
transit	B-Application
service	O
is	O
typically	O
priced	O
per	O
megabit	O
per	O
second	O
per	O
month	O
,	O
and	O
customers	O
are	O
often	O
required	O
to	O
commit	O
to	O
a	O
minimum	O
volume	O
of	O
bandwidth	O
,	O
and	O
usually	O
to	O
a	O
minimum	O
term	O
of	O
service	O
as	O
well	O
,	O
usually	O
using	O
a	O
95e	O
percentile	O
burstable	O
billing	O
scheme	O
.	O
</s>
<s>
Some	O
transit	B-Application
agreements	O
provide	O
"	O
service-level	O
agreements	O
"	O
which	O
purport	O
to	O
offer	O
money-back	O
guarantees	O
of	O
performance	O
between	O
the	O
customer	O
's	O
Internet	O
connection	O
and	O
specific	O
points	O
on	O
the	O
Internet	O
,	O
typically	O
major	O
Internet	B-Protocol
exchange	I-Protocol
points	I-Protocol
within	O
a	O
continental	O
geography	O
such	O
as	O
North	O
America	O
.	O
</s>
<s>
These	O
service	O
level	O
agreements	O
still	O
provide	O
only	O
best-effort	O
delivery	O
since	O
they	O
do	O
not	O
guarantee	O
service	O
the	O
other	O
half	O
of	O
the	O
way	O
,	O
from	O
the	O
Internet	B-Protocol
exchange	I-Protocol
point	I-Protocol
to	O
the	O
final	O
destination	O
.	O
</s>
