When you're lonely, I wish you Love! When you're down, I wish you Joy! When you're troubled, I wish you Peace! When things seem empty, I wish you Hope! Have a Happy New Year!
Check these links..I hope they will be handy
http://homepages.uel.ac.uk/u0306091/Network.htm
http://www.buzzle.com/articles/advantages-and-disadvantages-of-different-network-topologies.html