Enterprise networks are networks that organizations build to interconnect its office locations for the easy sharing of computer resources. Private enterprise networks may have a combination of intranets and extranets. An intranet is a set of networks under the control of a single administrator. It uses IP protocol and IP-based tools like file transfer applications and web browsers. An extranet is the network that is administered by a single organization but supports access to an external network. The concept of the internetwork is of significance to enterprise networks. An internetwork refers to the connection of multiple computer networks through a common routing technology. The largest example of an internetwork is the Internet. Network traffic is carried out through network paths by routing. It is done for packet switched networks and circuit switching networks. This textbook is a compilation of chapters that discuss the most vital concepts in the field of enterprise networks. The topics included herein are of the utmost significance and bound to provide incredible insights to readers. It aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.