This book handle all the basic concept of networking in very effective comprehensive and understandable manner which explain every concept with a schematic diagram where necessary. This is a very important book that covers syllabus of B.Sc. (Computer Sciences), BCA, MCA, BE, Polytechnic, Computer Engineering, MCM & DCA degree courses of most of the Universities of the World. Networking or computer networking can be defined as the engineering discipline concerned with communication between computer systems as device. A computer network is any set of computers as device connected to each other with the ability to exchange data. It relies heavily upon the theoretical and practical application of scientific discipline such as telecommunication computer science information technology & computer engineering.