What is spanning tree protocol ?

Algorhyme

I think that I shall never see
a graph more lovely than a tree.
A tree whose crucial property
is loop-free connectivity.
A tree that must be sure to span
so packet can reach every LAN.
First, the root must be selected.
By ID, it is elected.
Least-cost paths from root are traced.
In the tree, these paths are placed.
A mesh is made by folks like me,
then bridges find a spanning tree.

-Radia Perlman

April Fools Day

Don't get fooled. Today is April 1st. Think before you believe :-). Here is the link to top 100 April fool's hoaxes of all time.

http://www.museumofhoaxes.com/hoax/aprilfool/