This book is a comprehensive introduction to Internet Infrastructure. It covers wired and wireless networks, the Internet (specifically the TCP/IP protocol), the domain name system (DNS), web servers and the HTTP/HTTPS protocols, web caches and various proxy server protocols, establishing IP addresses, and cloud computing. The book also includes forms of encryption technologies, securing networks and servers, network analysis tools, load balancing, mechanisms for redundancy, and more. Each concept chapter is followed by a case study chapter to illustrate the concepts presented. The case study chapters are set up so that readers can install servers and experiment with their configurations.