Network caching can play a vital role in today"s scenario as the internet traffic is growing tremendously. This book is an attempt to perform network caching and calculate the efficiency using Zipf flow based message requests.The Abilene network is taken as input network,experiment is done and results are discussed.Finally the challenges and conclusions in the network caching are discussed. This book proves that network caching is important in today"s model which is "pay as you go model".