Summary
With this chapter behind us, you should have a good understanding of the hierarchal organization of the various networking and application protocols, as described in the OSI model. You should have a solid understanding of TCP and UDP, in particular how both protocols use ports, and how TCP sessions are set up and torn down. Using netstat or ss to see how your host is connecting to various remote services, or what services your host is listening for, is a skill you can use going forward. Expanding on this, using port scanners to see what hosts and network services are running in your organization should be a skill that you should find useful. Finally, our discussion of Linux wireless tools should help in troubleshooting, configuration, and wireless site surveys. All of these skills will be things we build on as we move forward in our journey in this book, but more importantly, they'll be useful in troubleshooting application and networking problems in your organization...