The official supplemental textbook for the Connecting Networks course in the Cisco Networking Academy CCNA Routing and Swtching curiculum. Introduction, Hierachical Network Designs, Connecting the WAN, Point-to-Point Connections, Frame Relay, Network Address Translation for IPv4, Broadband Solutions, Securing Site-to-Site Connectivity, Monitoring the Network, Troubleshooting the Network, Answers to the Check Your Understanding Questions.