Chapter Summary

This chapter has offered a lot to learn, but the information covered here is among the most important you'll need to know if you are to pass the exam. You can expect that what you learned in this chapter will account for twenty five percent or more of the exam. From this chapter you should have learned about the DoD Reference model, which is a four-layer model that parallels the seven levels in the OSI Reference model.

This chapter also covered almost every aspect of configuring TCP/IP networks on a Cisco router. You learned everything from the basic steps for configuring an IP address on an interface, to how to configure a Gateway of Last Resort, to how to work with DNS servers, to how to subnet IP addresses, and how to configure DHCP server services on a router.

You need to remember the TCP/IP diagnostic commands, such as ping and trace , to isolate connectivity problems. There are many syntaxes that you can use with the debug and the show ip commands. You should know which syntaxes will help you diagnose protocol problems or narrow the scope of possible problems.