Computer network is one of the fundamental components of information and communication technology in providing data communication channels. Computer networks and data communications are becoming convergent due to the need for versatile data communication channels with varied requirements characteristics. An understanding of computer networks in basic communication principles, network design approaches, and the standards used, communication models to their security are important learning points to master this field. Computer networks also cover the theoretical, technical, operational aspects and best practices used in the scientific and industrial fields. The rapid development has caused the computer network material to also have to enter a new area in the telecommunications aspect which is one of the most familiar data communication models today.