Summary

This chapter follows the troubleshooting methodology suggested in Chapter 4, "Troubleshooting Approaches, Models, and Tools," with a layer-by-layer, phase-by-phase approach to remote access dial issues. Some of the topics of the chapter, such as detailed troubleshooting NAS WAN Links and T1s PRIs, are relevant to other parts of the book. This chapter includes an extensive amount of information about troubleshooting dial-in and dial-out services, where the modem's operational status is covered in greatest detail. The specifics of the different NAS platforms provided in this chapter can serve as a practical troubleshooting manual when dealing with all the different platforms of 5x00 NASs.