<s>
A	O
tree	O
topology	B-Architecture
,	O
or	O
star-bus	O
topology	B-Architecture
,	O
is	O
a	O
hybrid	O
network	B-Architecture
topology	I-Architecture
in	O
which	O
star	B-Architecture
networks	I-Architecture
are	O
interconnected	O
via	O
bus	B-Architecture
networks	I-Architecture
.	O
</s>
<s>
Tree	O
networks	O
are	O
hierarchical	O
,	O
and	O
each	O
node	B-Protocol
can	O
have	O
an	O
arbitrary	O
number	O
of	O
child	O
nodes	O
.	O
</s>
