virtual networking

hello guys,i'm presently working as network administrator

i want to know is there any tutorial that can explain the networking methods in animated way.. ( i.e packets routing through routers ,swithches,,..etc)
some thing like flash files that explain how packets form and how they'll get routed and all...

if any one have info regarding this plz reply ,,i'll be very thank ful

www.peterpacket.org/

Thank you very much Mr Gosbollen