<s>
In	O
computer	B-Architecture
networking	I-Architecture
,	O
per-hop	B-Protocol
behaviour	I-Protocol
(	O
PHB	O
)	O
is	O
a	O
term	O
used	O
in	O
differentiated	O
services	O
(	O
DiffServ	O
)	O
or	O
multiprotocol	B-Protocol
label	I-Protocol
switching	I-Protocol
(	O
MPLS	B-Protocol
)	O
.	O
</s>
<s>
It	O
defines	O
the	O
policy	O
and	O
priority	O
applied	O
to	O
a	O
packet	O
when	O
traversing	O
a	O
hop	O
(	O
such	O
as	O
a	O
router	B-Protocol
)	O
in	O
a	O
DiffServ	O
network	O
.	O
</s>
