<s>
A	O
tree	B-Data_Structure
topology	I-Data_Structure
,	O
or	O
star-bus	O
topology	O
,	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	B-Data_Structure
networks	I-Data_Structure
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>
<s>
Three	O
parameters	O
are	O
crucial	O
in	O
determining	O
the	O
statistics	O
of	O
random	O
tree	B-Data_Structure
networks	I-Data_Structure
,	O
first	O
,	O
the	O
branching	O
probability	O
,	O
second	O
the	O
maximum	O
number	O
of	O
allowed	O
progenies	O
at	O
each	O
branching	O
point	O
,	O
and	O
third	O
the	O
maximum	O
number	O
of	O
generations	O
,	O
that	O
a	O
tree	O
can	O
attain	O
.	O
</s>
<s>
There	O
are	O
a	O
lot	O
of	O
studies	O
that	O
address	O
the	O
large	O
tree	B-Data_Structure
networks	I-Data_Structure
,	O
however	O
small	O
tree	B-Data_Structure
networks	I-Data_Structure
are	O
seldom	O
studied	O
.	O
</s>
<s>
These	O
tools	O
could	O
be	O
used	O
to	O
study	O
the	O
tree	B-Data_Structure
networks	I-Data_Structure
as	O
well	O
.	O
</s>
